138 results on '"J. Koerts"'
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2. OVER HET GEWENSTE RENDEMENT VAN INVESTERINGEN
- Author
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J. Koerts and L. W. Kokee
- Subjects
Business ,HF5001-6182 ,Business mathematics. Commercial arithmetic. Including tables, etc. ,HF5691-5716 - Published
- 1965
- Full Text
- View/download PDF
3. The Development of the Screening of Visual Complaints Questionnaire for Patients with Neurodegenerative Disorders: Evaluation of Psychometric Properties
- Author
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F Huizinga, J Heutink, G A De Haan, I Van Der Lijn, F E Van Der Feen, A C L Vrijling, B J M Melis-Dankers, S M De Vries, O Tucha, and J Koerts
- Published
- 2019
- Full Text
- View/download PDF
4. Henri Theil’s Contributions to Economics and Econometrics : Volume II: Consumer Demand Analysis and Information Theory
- Author
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B. Raj, J. Koerts, B. Raj, and J. Koerts
- Subjects
- Econometrics, Operations research, Statistics, Economics
- Abstract
PREFACE TO THE COLLECTION PREAMBLE The editors are pleased to present a selection of Henri Theil's contributions to economics and econometrics in three volumes. In Volume I we have provided an overview of Theil's contributions, a brief biography, an annotated bibliography of his research, and a selection of published and unpublished articles and chapters in books dealing with topics in econometrics. Volume II contains Theil's contributions to demand analysis and information theory. Volume III includes Theil's contributions in economic policy and forecasting, and management science. The selection of articles is intended to provide examples of Theil's many seminal and pathbreaking contributions to economics in such areas as econometrics, statistics, demand analysis, information theory, economic policy analysis, aggregation theory, forecasting, index numbers, management science, sociology, operations research, higher education and much more. The collection is also intended to serve as a tribute to him on the occasion of his 68th birthday: These three volumes also highlight some of Theil's contributions and service to the profession as a leader, advisor, administrator, teacher, and researcher. Theil's contributions, which encompass many disciplines, have been extensively cited both in scientific and professional journals. These citations often place Theil among 10 researchers (ranked according to number of times cited) in the world in various the top disciplines.
- Published
- 2012
5. Henri Theil’s Contributions to Economics and Econometrics : Volume III: Economic Policy and Forecasts, and Management Science
- Author
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B. Raj, J. Koerts, B. Raj, and J. Koerts
- Subjects
- Econometrics, Operations research, Statistics, Economics
- Abstract
PREFACE TO THE COLLECTION PREAMBLE The editors are pleased to present a selection of Henri Theil's contributions to economics and econometrics in three volumes. In Volume I we have provided an overview of Theil's contributions, a brief biography, an annotated bibliography of his research, and a selection of published and unpublished articles and chapters in books dealing with topics in econometrics. Volume II contains Theil's contributions to demand analysis and information theory. Volume III includes Theil's contributions in economic policy and forecasting, and management science. The selection of articles is intended to provide examples of Theil's many seminal and path breaking contributions to economics in such areas as econometrics, statistics, demand analysis, information theory, economic policy analysis, aggregation theory, forecasting, index numbers, management science, sociology, operations research, higher education and much more. The collection is also intended to serve as a tribute to him on the occasion of his 67th birthday.! These three volumes also highlight some of Theil's contributions and service to the profession as a leader, advisor, administrator, teacher, and researcher. Theil's contributions, which encompass many disciplines, have been extensively cited both in scientific and professional journals. These citations often place Theil among the top 10 researchers (ranked according to number of times cited) in the world in various disciplines.
- Published
- 2012
6. Henri Theil’s Contributions to Economics and Econometrics : Econometric Theory and Methodology
- Author
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B. Raj, J. Koerts, B. Raj, and J. Koerts
- Subjects
- Econometrics, Operations research, Statistics, Economics
- Abstract
PREFACE TO THE COLLECTION PREAMBLE The editors are pleased to present a selection of Henri Theil's contributions to economics and econometrics in three volumes. In Volume I we have provided an overview of Theil's contributions, a brief biography, an annotated bibliography of his research, and a selection of published and unpublished articles and chapters in books dealing with topics in econometrics. Volume IT contains Theil's contributions to demand analysis and information theory. Volume ITI includes Theil's contributions in economic policy and forecasting, and management science. The selection of articles is intended to provide examples of Theil's many seminal and pathbreaking contributions to economics in such areas as econometrics, statistics, demand analysis, information theory, economic policy analysis, aggregation theory, forecasting, index numbers, management science, sociology, operations research, higher education and much more. The collection is also intended to serve as a tribute to him on the occasion of his 67th birthday.! These three volumes also highlight some of Theil's contributions and service to the profession as a leader, advisor, administrator, teacher, and researcher. Theil's contributions, which encompass many disciplines, have been extensively cited both in scientific and professional journals. These citations often place Theil among the top 10 researchers (ranked according to number of times cited) in the world in various disciplines.
- Published
- 2012
7. Biosynthesis and chemical determination of polyfluoro-4-hydroxyanilines
- Author
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J.J.M. Vervoort, S. Boeren, I.M.C.M. Rietjens, and J. Koerts
- Subjects
Chromatography ,Metabolite ,Assay ,Biochemie ,General Chemistry ,Fluorine-19 NMR ,Urine ,Biochemistry ,Hydrolysis ,chemistry.chemical_compound ,Biotransformation ,chemistry ,Biosynthesis ,Yield (chemistry) ,Life Science - Abstract
This paper describes methods for the biosynthesis and chemical determination of polyfluorinated 4-hydroxyanilines. 19F NMR was routinely used to determine recoveries and metabolite patterns. Male Wistar rats exposed to ortho- and/or meta-polyfluorinated anilines were shown, by 19F NMR analysis of urine samples, to excrete a large percentage of the administered dose as the corresponding 4-aminophenyl sulphate. Using a Bio-Gel P2 column, this metabolite could be separated from the other metabolites and from (nearly) all urine contaminants. Treatment of the pooled fractions of the Bio-Gel P2 column with arylsulphatase resulted in hydrolysis of the 4-aminophenyl sulphate, giving rise to the corresponding polyfluoro-4-hydroxyaniline. The yields of this biosynthetic pathway varied between 10 and 65% depending on the substitution pattern. The yield is mainly determined by the extent to which the in-vivo biotransformation results in the desired 4-aminophenyl sulphate and its separation from other urine metabolites on the Bio-Gel P2 column. The amounts of polyfluoro-4-hydroxyanilines prepared in this way were sufficient to develop a chemical assay for their determination and quantification in biological samples in the μM range. It was demonstrated that polyfluoro-4-hydroxyanilines can be measured using the assay described for nonfluorinated 4-hydroxyaniline.
- Published
- 1991
8. Prevention of weight gain in type 2 diabetes requiring insulin treatment
- Author
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H.D. de Boer, J. Koerts, L. Verschoor, and M. Jansen
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Blood Glucose ,Male ,medicine.medical_specialty ,Endocrinology, Diabetes and Metabolism ,medicine.medical_treatment ,Pilot Projects ,Type 2 diabetes ,Overweight ,Weight Gain ,Drug Administration Schedule ,Insulin aspart ,Endocrinology ,Internal medicine ,Internal Medicine ,Medicine ,Humans ,Hypoglycemic Agents ,Insulin ,C-Peptide ,business.industry ,Middle Aged ,medicine.disease ,Metformin ,Glimepiride ,Postprandial ,Sulfonylurea Compounds ,Diabetes Mellitus, Type 2 ,Drug Therapy, Combination ,Female ,medicine.symptom ,business ,Hyperinsulinism ,Weight gain ,medicine.drug - Abstract
Background: Patients with type 2 diabetes who are failing on oral agents will generally gain a large amount of body fat when switched to insulin treatment. This adverse effect may be related to chronic hyperinsulinism induced by long-acting insulin compounds. Aim: To test the concept that regain of glycaemic control can be achieved without causing weight gain, using a regimen free of long-acting insulin. Methods: In a 3-month open-label pilot study including 25 patients with moderate overweight and secondary failure, we investigated whether nocturnal glycaemic control could be achieved with glimepiride administered at 20:00 hours. The starting dose was 1–2 mg, with subsequent titration up to a maximum of 6 mg. Rapid-acting insulin analogues were used three times daily to regain postprandial glucose control. Results: Glycaemic control at 3 months was established with glimepiride in a dose of 4.4 ± 0.3 mg/day (mean ± standard error of the mean), and a total daily insulin dose of 24.1 ± 2.6 IU. Fasting glucose levels decreased from 12.7 ± 0.6 mmol/l to 8.1 ± 0.3 mmol/l (p
- Published
- 2004
9. Elevated levels of platelet microparticles are associated with disease activity in rheumatoid arthritis
- Author
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Ellen A J Knijff-Dutmer, E. M. Kalsbeek-Batenburg, M.A.F.J. van de Laar, Rienk Nieuwland, J Koerts, and Laboratory for Experimental Clinical Chemistry
- Subjects
Adult ,Blood Platelets ,Male ,medicine.medical_specialty ,Immunology ,Arthritis ,Gastroenterology ,Severity of Illness Index ,Arthritis, Rheumatoid ,Rheumatology ,Immunopathology ,Internal medicine ,Blood plasma ,Immunology and Allergy ,Medicine ,Humans ,Pharmacology (medical) ,Platelet ,Aged ,Autoimmune disease ,medicine.diagnostic_test ,business.industry ,Platelet Count ,Liter ,Middle Aged ,medicine.disease ,Cross-Sectional Studies ,Rheumatoid arthritis ,Erythrocyte sedimentation rate ,Female ,business - Abstract
Objective. Platelets are involved in various thrombotic events, often by means of platelet-derived microparticles (PMPs). It is likely that platelets are also involved in inflammation. Because inflammatory processes play a central role in rheumatoid arthritis (RA), we sought to determine whether PMPs are present in this disease. Methods. This descriptive, cross-sectional study included 19 RA patients and 10 healthy controls. Nine of the patients had active RA (erythrocyte sedimentation rate [ESR] greater than or equal to28 mm/hour and/or C-reactive protein [CRP] level greater than or equal to28 mg/liter, greater than or equal to9 painful joints, and greater than or equal to6 swollen joints), and 10 had inactive disease (ESR less than or equal to27 mm/hour, CRP :527 mg/liter, no tender joints, and no swollen joints). Platelet counts and PMP numbers were determined using cell counter and flow cytometry, respectively. Results. Platelet counts in the 3 groups were similar. However, levels of PMPs in RA patients were significantly higher than those in healthy controls (median 616 versus 118 x 10(6)/liter, P = 0.005). PMP levels were higher in patients with active RA than in those with inactive RA (median 2,104 versus 504 x 10(6)/liter; P > 0.05). Moreover, PMP levels correlated with disease activity (r = 0.67, P = 0.05). Conclusion. PMPs are associated with RA, and PMP levels are correlated with disease activity. Thus, platelets probably play a part in the inflammatory process of RA by means of PMPs. Given the importance of PMPs in cardiovascular diseases, this may be one reason for the enhanced cardiovascular morbidity and mortality in RA
- Published
- 2002
10. AB0035 Platelet microparticles in patients with rheumatoid arthritis
- Author
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M.A.F.J. van de Laar, J Koerts, Ellen A J Knijff-Dutmer, and E. M. Kalsbeek-Batenburg
- Subjects
medicine.medical_specialty ,Platelet-activating factor ,business.industry ,High mortality ,Swollen joints ,Disease ,medicine.disease ,Gastroenterology ,chemistry.chemical_compound ,chemistry ,Internal medicine ,Rheumatoid arthritis ,medicine ,Rheumatoid factor ,Platelet ,In patient ,business - Abstract
Background Platelet microparticles (PMP) contain pro-coagulant as well as pro-inflammatory substances like platelet activating factor (PAF) and P-selectin. Rheumatoid arthritis (RA) is associated with increased concentrations of both PAF and P-selectin, but the link with PMP has never been investigated. Objectives To test the hypothesis that patients with RA have elevated levels of PMPs and that these levels are associated with disease activity. Methods This was a descriptive study in patients with RA, using neither anticoagulants nor corticosteroids. The patients were divided in two groups, according to disease activity. Criteria for active RA were: ESR at least 28 mmh and/or CRP at least 28 mg/dl plus more than 8 painful and more than 5 swollen joints. Criteria for RA in remission were: ESR Results Ten patients with active RA and ten patients with RA in remission were included. There were 5 men and 15 women. The mean age was 61 years, the mean disease duration was 6 years and 75% was rheumatoid factor positive (comparable in both groups). The mean number of PMPs in RA patients was 3,173 × 106/L versus 451 × 106/L in healthy volunteers (p = 0.005). See Table 1 for further results: Conclusion This study confirms the hypothesis that patients with RA have higher numbers of PMPs; moreover, the presence of PMPs is associated with disease activity. This observation is most probably the missing link between the studies on the PMP content in general and the raised PAF- and P-selectin levels in sera from patients with RA. Moreover, one may speculate on the possible meaning of these elevated PMPs for the well-known high mortality due to cardiovascular disease in patients with RA. More research may clarify this.
- Published
- 2001
11. A COMPARISON BETWEEN THE POWER OF THE DURBIN-WATSON TEST AND THE POWER OF THE BLUS TEST.
- Author
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Abrahamse, A. P. J. and J. Koerts
- Subjects
- *
PROBABILITY theory , *DISTRIBUTION (Probability theory) , *STATISTICS , *VON Neumann algebras , *HYPOTHESIS , *STATISTICAL hypothesis testing , *DECISION making - Abstract
In an earlier paper [5] the authors compared the power of the BLUS test with the probability of a correct decision of the Durbin-Watson bounds test. A method to compute the distribution of the Von Neumann ratio under the null hypothesis and under the alternative hypothesis was given. In the present paper the latter method is used to tabulate the BLUS-test statistic and to compute the exact significance points of the Durbin-Watson test for several examples. Powers of both tests are computed and compared. It appears that, for the cases considered, the power of the exact Durbin-Watson test exceeds that of the BLUS procedure, while the latter is greater than the probability of a correct decision in the Durbin-Watson bounds test. [ABSTRACT FROM AUTHOR]
- Published
- 1969
- Full Text
- View/download PDF
12. On the robustness of an estimator of the mean of the dependent variable in a multiplicative model
- Author
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J. Koerts, R. Teekens, and A. S. Louter
- Subjects
Statistics and Probability ,Minimum-variance unbiased estimator ,Variables ,Robustness (computer science) ,media_common.quotation_subject ,Statistics ,Applied mathematics ,Estimator ,Statistics, Probability and Uncertainty ,Multiplicative model ,media_common ,Mathematics - Published
- 1973
13. Statistical inference and subjective probabilities
- Author
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J. Koerts and E. de Leede
- Subjects
Statistics and Probability ,Interpretation (logic) ,Binomial process ,Frequentist inference ,Prior probability ,Statistics ,Process (computing) ,Statistical inference ,Inference ,Statistics, Probability and Uncertainty ,Value (mathematics) ,Mathematics - Abstract
Summary “Learning by experience” is a well-known part of the theory of subjective probabilities; the learning process is often derived from some prior distribution F(p) where p is a parameter of unknown value of a binomial process for instance. In this paper, the learning process is explicitly formulated and the corresponding prior distribution is derived from it. In this interpretation, subjective probabilities are part of an inference methodology, rather than a subjective evaluation of frequentistic probabilities. Implications are considered for a concept like the “non-informative prior; the situation is considered in which the learning process seems to be in contact with some objectively determined prior.
- Published
- 1973
14. The correlation coefficient in the general linear model
- Author
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J. Koerts and A.P.J. Abrahamse
- Subjects
RV coefficient ,Economics and Econometrics ,Coefficient of determination ,Correlation coefficient ,Fisher transformation ,Scaled correlation ,Correlation ratio ,Spearman's rank correlation coefficient ,Pearson product-moment correlation coefficient ,symbols.namesake ,Statistics ,Economics ,symbols ,Finance - Published
- 1970
15. Economics and the probability concept
- Author
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E. De Leede and J. Koerts
- Subjects
Large class ,Arts and Humanities (miscellaneous) ,Developmental and Educational Psychology ,Experimental and Cognitive Psychology ,General Medicine ,Positive economics ,Psychology - Abstract
The authors discuss the attitude of economists towards several interpretations of the probability concept. In some cases the frequency approach can be used without difficulties. In other cases the personalistic theory is generally accepted. For the large class of problems where only a relatively limited amount of information is available the economists appear to be reluctant to bring personalistic ideas into the model.
- Published
- 1970
16. A simulation approach to the problem of the relationship between business test data and conventional statistics
- Author
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J. Koerts and J. Boas
- Subjects
Statistics and Probability ,Statistics, Probability and Uncertainty ,Humanities ,Mathematics - Abstract
Samenvatting De conjunctuurtest is opgezet met het doel op korte termijn inzicht te verkrijgen in de bewegingen van belangrijke economische variabelen. Daartoe worden de ondernemers vragen gesteld d.m.v. een enqueteformulier omtrent grootheden als productie, afzet etc. De conjunctuurtest laat slechts 3 antwoorden toe: de variabele in kwestie is gestegen, gelijk gebleven of gedaald. Bij dit soort analyses bestaat onzekerheid over de vraag hoe een ondernemer het antwoord “geen verandering” zal interpreteren. Dit probleem is als volgt aangepakt. Voor de ondernemers zijn gespecificeerd de “response functions” p(δ) en q(δ). De functie p(δ) geeft aan de kans dat een ondernemer een stijging zal melden indien hij met een numerieke productie verandering 6 wordt geconfronteerd. De functie q(δ) geeft aan de kans dat hij een doling zal melden bij eenzelfde productieverandering δ. Vervolgens zijn voor de waargenomen productie wijzigingen in de chemische Industrie over de periode januari 1955 t/m december 1957 de waarschijnlijkheden van de meldingen “stijging” p(δ) en “daling” q(δ) bepaald. Hierna zijn met behulp van een computer de antwoorden van de ondernemers gesimuleerd. Zie voor deze techniek sectie 4. Met behulp van de regressie analyse is vervolgens de samenhang onderzocht tussen de conjunctuurtestgegevens en de productiecijfers van traditionele statistiek. Voor de gebruikte specif caties blijkt dat de correlatie coefficienten worden ver-laagd indien de varianties van de “response” functies groter worden.
- Published
- 1964
17. A new class of disturbance estimators in the general linear model
- Author
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J. Koerts, C. Dubbelman, and A. P. J. Abrahamse
- Subjects
Statistics and Probability ,General linear model ,Proper linear model ,Disturbance (geology) ,Linear model ,Applied mathematics ,Estimator ,Log-linear model ,Statistics, Probability and Uncertainty ,Generalized linear mixed model ,Mathematics - Published
- 1972
18. Simultaneous minimization of the error probabilities in a statistical test: An economic example
- Author
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J. Koerts and A. P. J. Abrahamse
- Subjects
Statistics and Probability ,Calculus ,Statistics, Probability and Uncertainty ,Humanities ,Mathematics - Abstract
Summary Bij het toetsen van hypothesen bestaat een verband tussen de kans op een fout van de eerste soort P(I), de kans op een fout van de tweede soort P(II) en de steekproef-omvang n. Bij een vaste n kan een optimale combinatie van P(I) en P(II) bepaald worden met behulp van een zgn. verliesfunctie. De specificatie van zulk een verliesfunctie is echter in veel gevallen moei-lijk. Vaak kiest men dan maar een P(I) op intultieve gronden. Dit artikel illustreert aan de hand van een eenvoudig economisch model dat zulk een P (I) vrij ver van het optimum kan afwijken. Specificatie van een verliesfunctie is hierbij niet nodig. Een bepaalde economische doelstelling i.e. winst-maximering blijkt hiervoor in de plaats te treden.
- Published
- 1968
19. On mean waiting times and their reduction by priority procedures: An expository survey and some tables
- Author
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J. Koerts
- Subjects
Statistics and Probability ,Reduction (complexity) ,Waiting time ,Computer science ,Statistics ,Statistics, Probability and Uncertainty - Published
- 1963
20. On the Kuiper test for normality with mean and variance unknown
- Author
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J. Koerts and A. S. Louter
- Subjects
Statistics and Probability ,Normal distribution ,Normality test ,Anderson–Darling test ,Statistics ,Chi-square test ,Z-test ,Variance (accounting) ,Statistics, Probability and Uncertainty ,Statistic ,Kuiper's test ,Mathematics - Abstract
Summary If one wants to test the hypothesis as to whether a set of observations comes from a completely specified continuous distribution or not, one can use the Kuiper test. But if one or more parameters have to be estimated, the standard tables for the Kuiper test are no longer valid. This paper presents a table to use with the Kuiper statistic for testing whether a sample comes from a normal distribution when the mean and variance are to be estimated from the sample. The critical points are obtained by means of Monte-Carlo calculation; the power of the test is estimated by simulation; and the results of the powers for several alternative distributions are compared with the estimated powers of the Kolmogorov-Smirnov test.
- Published
- 1970
21. Economie en kansspel
- Author
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J. Koerts
- Subjects
Macroeconomics ,Economics and Econometrics ,Economics ,Public finance - Published
- 1966
22. New Estimators of Disturbances in Regression Analysis
- Author
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J. Koerts and A. P. J. Abrahamse
- Subjects
Statistics and Probability ,Covariance matrix ,media_common.quotation_subject ,Autocorrelation ,Linear model ,Estimator ,Regression analysis ,Covariance ,Estimation of covariance matrices ,Statistics ,Statistics, Probability and Uncertainty ,Normality ,Mathematics ,media_common - Abstract
In this article, an alternative v for the vector u of least-squares residuals in the linear model is derived. It is best in the class of all linear unbiased estimators' of u having a certain fixed covariance matrix chosen a priori. Under the normality assumption, the distribution of the Von Neumann Ratio based on v is independent of the regression vectors, so that v is particularly useful for testing on serial correlation of the disturbances. It is pointed out that the existing tests for serial correlation in economic time-series models might be improved by using v based on an appropriate covariance matrix; the Durbin-Watson upper-bound tables can be used for this purpose.
- Published
- 1971
23. On the Power of the Blus Procedure
- Author
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J. Koerts and A. P. J. Abrahamse
- Subjects
Statistics and Probability ,Mathematical optimization ,Distribution (mathematics) ,Simple (abstract algebra) ,Autocorrelation ,Applied mathematics ,Statistics, Probability and Uncertainty ,Regression ,Power (physics) ,Mathematics - Abstract
This article deals with the power of the BLUS test on autocorrelation among regression disturbances. To compute this power a simple method is presented for computing the distribution of any ratio of quadratic forms in normal variables. Three examples are given where the BLUS powers are compared with the fractions of correct decisions of the usual Durbin-Watson test.
- Published
- 1968
24. Introductory Remarks
- Author
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J. Koerts
- Published
- 1982
25. Modelling and Marketing, Two Important Concepts and the Connection Between Them
- Author
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J. Koerts and Pieters Leeflang
- Subjects
Marketing ,Personalized marketing ,Computer science ,Division (mathematics) ,Quantitative marketing research ,Marketing research ,Connection (mathematics) - Abstract
Gives a general definition of the concept of marketing with the end of Tunbergen's division of the elements which form an economy. Provides an additional definition – “marketing in a limited sense”. Determines to what degree marketing in a limited sence has been developed. Considers some classification models developed during the last 15 years.
- Published
- 1973
26. Generalized linear models
- Author
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J. Koerts
- Subjects
Generalized linear model ,Information Systems and Management ,General Computer Science ,Modeling and Simulation ,Applied probability ,Regional science ,Management Science and Operations Research ,Mathematical economics ,Industrial and Manufacturing Engineering ,Mathematics - Published
- 1984
27. On the Theory and Application of the General Linear Model
- Author
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J. D. Sargan, J. Koerts, and A. P. J. Abrahamse
- Subjects
Parameter identification problem ,General linear model ,Simultaneous equations model ,Economics and Econometrics ,Proper linear model ,Bayesian multivariate linear regression ,Linear regression ,Econometrics ,Linear model ,Applied mathematics ,Regression analysis ,Mathematics - Published
- 1970
28. Prediction Methods in Multiplicative Models
- Author
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J. Koerts and Rudolf Teekens
- Subjects
Economics and Econometrics ,Computer science ,Prediction methods ,Multiplicative function ,Applied mathematics - Published
- 1973
29. Unmet Financial Needs of People with Psychotic Disorders-A Cross-Sectional Study in People with Psychotic Disorders, Parents, Siblings, and Controls.
- Author
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Jansen JL, Hao J, Bruggeman R, Simons CJP, Van der Pluijm M, Koerts J, and Krabbendam L
- Abstract
Background . Psychotic disorders have a strong negative impact on people's lives, including their financial situation. This study aimed to examine differences in unmet financial needs between people with psychotic disorders, parents, siblings, and controls. Secondly, we aimed to examine whether family clustering contributes to unmet financial needs. Lastly, we aimed to examine to what extent demographic, economic, psychiatric, functional, and cognitive characteristics and substance use predict unmet financial needs in people with psychosis. Methods. Data from the first assessment of people with psychosis ( n = 956), siblings ( n = 889), parents ( n = 858), and controls ( n = 496) included in the Genetic Risk and Outcome of Psychosis study were used. Group differences were assessed with Kruskal-Wallis tests (aim 1), while a mixed-effects logistic regression analysis and explorative and confirmative ordinal logistic regression analyses were conducted for aims 2 and 3, respectively. Results. Twenty-four percent of people with psychotic disorders reported unmet financial needs. These levels of unmet financial needs were significantly higher than levels for siblings, parents, and controls. We found a negligible influence of (direct) familial clustering on unmet financial needs. Lastly, cannabis and tobacco use significantly and consistently predicted higher levels of unmet financial needs of people with psychosis. Conclusions. Relatively high levels of unmet financial needs occurred in a heterogeneous group of people with psychosis, especially when people used cannabis or tobacco. Unmet financial needs can have detrimental consequences for mental health, stigmatization, leisure time activities, and social engagement. Thus, it is pivotal to recognize unmet financial needs, especially combined with substance use, as a crucial stressor for people with psychosis.
- Published
- 2024
- Full Text
- View/download PDF
30. Financial capability of people living with Parkinson's disease - A case-control study.
- Author
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Ariesen AD, Tucha O, Bangma DF, Fuermaier ABM, Jansen JL, De Deyn PP, and Koerts J
- Abstract
Parkinson's disease (PD) is a neurodegenerative disorder affecting 1% of people older than 60 years. One of the abilities that seems vulnerable to the cognitive impairments associated with PD is financial capability. This explorative study aimed to evaluate the extent and type of problems in financial capability of people with PD without a diagnosis of dementia. Participants were 31 people with PD and 62 matched controls. Participants completed an extensive test-battery, including measures for financial capability and cognitive functioning. Compared to controls, the PD-group performed significantly poorer on two financial competence tasks and showed a comparable performance on the other financial capability measures. For 45% of the PD-group, cognitive test performance was indicative of mild cognitive impairment, yet no significant difference was observed in overall cognitive functioning between the PD and control group. In the total sample, only small or medium correlations were found between financial competence and cognition, and between financial capability and the contextual factors of income and financial experience. The findings suggest that in the earlier stages of PD, when cognitive impairments are relatively mild, some problems may be observed in financial competence, yet other domains of financial capability appear less affected. The absence of strong correlations between financial competence and overall cognitive functioning indicates that standard neuropsychological assessments seem inadequate to make financial capability determinations. By offering insight into the financial capability of people in the milder stages of PD, the findings of the present study may aid in the development and provision of tailored support.
- Published
- 2024
- Full Text
- View/download PDF
31. Let Us Talk Money: Subjectively Reported Financial Performance of People Living with Neurodegenerative Diseases-A Systematic Review.
- Author
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Ariesen AD, Tuomainen RE, De Deyn PP, Tucha O, and Koerts J
- Subjects
- Humans, Alzheimer Disease psychology, Alzheimer Disease economics, Neuropsychological Tests, Parkinson Disease psychology, Parkinson Disease economics, Neurodegenerative Diseases psychology, Neurodegenerative Diseases economics, Cognitive Dysfunction
- Abstract
Neurodegenerative diseases (NDDs) form a heterogeneous, widespread group of disorders, generally characterized by progressive cognitive decline and neuropsychiatric disturbances. One of the abilities that seems particularly vulnerable to the impairments in neurodegenerative diseases is the capability to manage one's personal finances. Indeed, people living with neurodegenerative diseases were shown to consistently present with more problems on performance-based financial tasks than healthy individuals. While objective, performance-based tasks provide insight into the financial competence of people living with neurodegenerative diseases in a controlled, standardized setting; relatively little can be said, based on these tasks, about their degree of success in dealing with the financial demands, issues, or questions of everyday life (i.e., financial performance). The aim of this systematic review is to provide an overview of the literature examining self and informant reports of financial performance in people living with neurodegenerative diseases. In total, 22 studies were included that compared the financial performance of people living with mild cognitive impairment (MCI), Alzheimer's disease (AD), Parkinson's disease, or multiple sclerosis to a (cognitively) normal control group. Overall, the results indicate that people living with neurodegenerative diseases are more vulnerable to impairments in financial performance than cognitively normal individuals and that the degree of reported problems seems to be related to the severity of cognitive decline. As the majority of studies however focused on MCI or AD and made use of limited assessment methods, future research should aim to develop and adopt more comprehensive assessments to study strengths and weaknesses in financial performance of people living with different neurodegenerative diseases., (© 2023. The Author(s).)
- Published
- 2024
- Full Text
- View/download PDF
32. Look who is complaining: Psychological factors predicting subjective cognitive complaints in a large community sample of older adults.
- Author
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Smit D, Koerts J, Bangma DF, Fuermaier ABM, Tucha L, and Tucha O
- Subjects
- Humans, Aged, Neuropsychological Tests, Executive Function, Surveys and Questionnaires, Cognition, Cognition Disorders diagnosis
- Abstract
Subjective cognitive complaints (SCCs) are not directly related to objective impairments in cognition. This study examines the role of psychological factors in predicting SCCs in the domains of executive functioning, memory, and attention in older adults. A community sample of 1,219 Dutch adults, aged 40 year or older, completed the BRIEF-A, MSEQ, FEDA, NEO-FFI, DASS-21, and a demographic questionnaire. Participants were randomly divided into exploratory ( n = 813) and confirmatory samples ( n = 406). In the exploratory sample, we analyzed whether personality factors, symptoms of depression and anxiety, perceived stress, and demographics could predict SCCs in the different cognitive domains. For this purpose, a two-step regression approach with bootstrapping was used. To independently validate the results, these analyses were repeated in the confirmatory sample. Concerning executive functioning, complaints regarding the ability to regulate behavior and emotional responses were predicted by lower agreeableness levels and higher levels of neuroticism and perceived stress. Complaints regarding the ability to actively solve problems in different circumstances were predicted by a lower conscientiousness level, higher agreeableness level, and more depressive symptoms. Attentional complaints were predicted by lower levels of conscientiousness and extraversion, together with a higher level of neuroticism. For memory, no significant predictors were consistently found. Psychological factors are of influence on the subjective experience of cognitive complaints. In particular personality factors, perceived stress, and symptoms of depression, seem to predict SCCs in the domains of executive functioning and attention. Clinicians should take these factors into account in older adults who have SCCs.
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- 2024
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33. Circular ZDHHC11 supports Burkitt lymphoma growth independent of its miR-150 binding capacity.
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Liu Y, Zhao X, Seitz A, Hooijsma AA, Ravanbakhsh R, Sheveleva S, de Jong D, Koerts J, Dzikiewicz-Krawczyk A, van den Berg A, Ziel-Swier LJYM, and Kluiver J
- Subjects
- Humans, Cell Line, Tumor, Cell Proliferation genetics, Gene Expression Regulation, Neoplastic, RNA, Messenger genetics, RNA, Circular, Burkitt Lymphoma pathology, MicroRNAs genetics
- Abstract
We previously showed that MYC promoted Burkitt lymphoma (BL) growth by inhibiting the tumor suppressor miR-150, resulting in release of miR-150 targets MYB and ZDHHC11. The ZDHHC11 gene encodes three different transcripts including a mRNA (pcZDHHC11), a linear long non-coding RNA (lncZDHHC11) and a circular RNA (circZDHHC11). All transcripts contain the same region with 18 miR-150 binding sites. Here we studied the relevance of circZDHHC11, including this miR-150 binding site region, for growth of BL cells. CircZDHHC11 was mainly present in the cytoplasmic fraction in BL cells and its localization was not altered upon miR-150 overexpression. Knockdown of circZDHHC11 caused a strong inhibition of BL growth without affecting the expression levels of MYC, MYB, miR-150 and other genes. Overexpression of circZDHHC11 neither affected cell growth, nor rescued the phenotype induced by miR-150 overexpression. Genomic deletion of the miR-150 binding site region did not affect growth, nor did it change the effect of circZDHHC11 knockdown. This indicated that the miR-150 binding site region is dispensable for the growth promoting role of circZDHHC11. To conclude, our results show that circZDHHC11 is a crucial factor supporting BL cell growth independent of its ability to sponge miR-150., (© 2024. The Author(s).)
- Published
- 2024
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34. Subjective Complaints and Coping Strategies of Individuals with Reported Low-Frequency Noise Perceptions.
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Erdelyi KH, Fuermaier ABM, Tucha L, Tucha O, and Koerts J
- Abstract
Background : Subjective everyday hindrances associated with low-frequency noise (LFN) can be high; however, there is still a lot unknown about experienced complaints. This study aims to investigate (1) subjective complaints and (2) coping strategies of individuals reporting everyday hindrances from LFN. Methods : Cognition, depressive symptoms, sleeping, fatigue, stress, and coping questionnaires were administered to participants sampled for their LFN complaints (LFN1 = 181), LFN complainants derived from a community sample (LFN2 = 239), and a comparison group without LFN complaints (CG = 410). Results : Individuals reporting LFN perceptions reported complaints in all domains and showed a higher proportion of above average symptom severity compared to the CG. Most complaints were reported by the LFN1 group, the least by the CG. However, on some sleeping, fatigue, and stress-related variables, a similar or even higher symptom severity was observed in the LFN2 group. Further, all groups used a similar combination of multiple coping strategies, although the LFN1 group scored higher on support seeking. Conclusions : There might be differences in the complaint severity between different LFN subgroups and future investigations of primary and secondary complaints are necessary. Also, more research about the use and success of coping strategies for LFN-related hindrances are needed for clear conclusions.
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- 2024
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35. Ischemia modified albumin as a marker of hypoxia in preterm infants in the first week after birth.
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van der Heide M, Muller Kobold AC, Koerts-Steijn KKR, Hulzebos CV, Hulscher JBF, Eaton S, Orford M, Bos AF, Koerts J, and Kooi EMW
- Subjects
- Humans, Infant, Newborn, Infant, Infant, Premature, Biomarkers, Retrospective Studies, Hemolysis, Serum Albumin, Hypoxia, Ischemia, Ductus Arteriosus, Patent, Hyperlipidemias
- Abstract
Background: Tissue hypoxia remains a leading cause of morbidity and mortality in preterm infants. Current biomarkers often detect irreversible hypoxic cellular injury (i.e. lactate) and are non-specific. A new biomarker is needed which detects tissue hypoxia before irreversible damage occurs., Aims: To investigate the relation between serum ischemia modified albumin (IMA), a marker of hypoxia; and analytic variables, patient related variables and conditions associated with hypoxia, in preterm infants., Study Design: Retrospective cohort study., Subjects: Infants with a gestational age < 30 weeks and/or birth weight < 1000 g., Outcome Measures: We collected two remnant blood samples in the first week after birth and measured IMA. IMA/albumin ratio (IMAR) was used to adjust for albumin. We assessed correlations between IMA(R) and analytic variables (albumin, lipemia- and haemolysis index); mean-2 h SpO
2 ; mean-2 h variability of regional splanchnic oxygen saturation (rs SO2 ), measured using near-infrared spectroscopy; and patent ductus arteriosus (PDA)., Results: Sixty-five infants were included. Albumin, the lipemia- and haemolysis index correlated negatively with IMA (r:-0.620, P<0.001; r:-0.458, P<0.001; and r:-0.337, P=0.002). IMAR correlated negatively with SpO2 (rho:-0.614, P<0.001). Lower rs SO2 variability correlated with higher IMAR values (rho:-0.785, n=14, P=0.001 and rho:-0.773, n=11, P=0.005). Infants with a hemodynamic significant PDA (hsPDA) had higher IMAR values than infants without PDA (0.13 [0.11-0.28], n=16 vs. 0.11 [0.08-0.20], n=29, P=0.005 and 0.11 [0.09-0.18], n=13 vs. 0.09 [0.06-0.17], n=37, P=0.026)., Conclusions: When adjusted for albumin, the lipemia- and haemolysis index, IMAR has potential value as a marker for systemic hypoxia in preterm infants, considering the associations with SpO2 , variability of rs SO2 , and hsPDA., Competing Interests: Declaration of competing interest The authors declare that they have no competing interests., (Crown Copyright © 2024. Published by Elsevier B.V. All rights reserved.)- Published
- 2024
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36. Financial dissatisfaction in people with psychotic disorders - A short report on its prevalence and correlates in a large naturalistic psychosis cohort.
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Jansen JL, Bruggeman R, Kiers HAL, Pijnenborg GHM, Castelein S, Veling W, Visser E, Krabbendam L, and Koerts J
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- Humans, Prevalence, Quality of Life, Emotions, Psychotic Disorders drug therapy, Substance-Related Disorders epidemiology
- Abstract
Psychotic disorders have a strong negative impact on multiple aspects of daily life, including people's financial situation. This exploratory study examines the level of financial dissatisfaction and its correlates in a large cohort of people with psychotic disorders. Data from the first assessments of people with psychotic disorders (n = 5271) who were included in the Pharmacotherapy Monitoring and Outcome Survey (PHAMOUS; 2006-2020), which is conducted in the northern Netherlands, were used. The Manchester Short Assessment of Quality of Life (MANSA) was used to measure financial dissatisfaction. In addition, sociodemographic and psychiatric characteristics, substance use and global and social functioning were assessed. One-fifth to one-third of people with psychotic disorders report financial dissatisfaction, fluctuating over the year in which they were assessed. These proportions are considerably higher than in the general population. Cannabis and other substance use were associated with higher levels of financial dissatisfaction (small to medium effect). The other significant associations showed (very) small effect sizes. Therefore, we conclude that financial dissatisfaction in people with psychotic disorders appears to be relatively independent of other demographic and psychiatric characteristics, and global and social functioning. These findings are an important first step for increasing knowledge on financial dissatisfaction among people with psychotic disorders. The findings can also contribute to raising awareness about the topic for healthcare professionals working in this field., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2024
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37. Proliferation-promoting roles of linear and circular PVT1 are independent of their ability to bind miRNAs in B-cell lymphoma.
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Zhao X, van den Berg A, Winkle M, Koerts J, Seitz A, de Jong D, Rutgers B, van der Sluis T, Bakker E, and Kluiver J
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- Humans, Homozygote, Sequence Deletion, Cell Proliferation genetics, Cell Line, Tumor, MicroRNAs genetics, MicroRNAs metabolism, Hodgkin Disease genetics, RNA, Long Noncoding genetics, RNA, Long Noncoding metabolism, Burkitt Lymphoma
- Abstract
Plasmacytoma Variant Translocation 1 (PVT1) is a long non-coding RNA located at 8q24.21 immediately downstream of MYC. Both the linear and circular PVT1 transcripts contribute to cancer pathogenesis by binding microRNAs. However, little is known about their roles in B-cell lymphoma. Here we studied their expression patterns, role in growth, and ability to bind miRNAs in B-cell lymphoma. Linear PVT1 transcripts were downregulated in B-cell cell lymphoma lines compared to germinal center B cells, while circPVT1 levels were increased. Two Hodgkin lymphoma cell lines had a homozygous deletion including the 5' region of the PVT1 locus, resulting in a complete lack of circPVT1 and 5' linear PVT1 transcripts. Inhibition of both linear and circular PVT1 decreased growth of Burkitt lymphoma, while the effects on Hodgkin lymphoma and diffuse large B cell lymphoma were less pronounced. Overexpression of circPVT1 promoted growth of B-cell lymphoma lacking or having low endogenous circPVT1 levels. Contrary to other types of cancer, linear and circular PVT1 transcripts did not interact with miRNAs in B-cell lymphoma. Overall, we showed an opposite expression pattern of linear and circular PVT1 in B-cell lymphoma. Their effect on growth was independent of their ability to bind miRNAs., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Anke van den Berg and Joost Kluiver obtained financial support provided by the Dutch Cancer Society., (Copyright © 2023 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2023
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38. Cognitive Underperformance in a Mixed Neuropsychiatric Sample at Diagnostic Evaluation of Adult ADHD.
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Dong H, Koerts J, Pijnenborg GHM, Scherbaum N, Müller BW, and Fuermaier ABM
- Abstract
(1) Background: The clinical assessment of attention-deficit/hyperactivity disorder (ADHD) in adulthood is known to show non-trivial base rates of noncredible performance and requires thorough validity assessment. (2) Objectives: The present study estimated base rates of noncredible performance in clinical evaluations of adult ADHD on one or more of 17 embedded validity indicators (EVIs). This study further examines the effect of the order of test administration on EVI failure rates, the association between cognitive underperformance and symptom overreporting, and the prediction of cognitive underperformance by clinical information. (3) Methods: A mixed neuropsychiatric sample (N = 464, ADHD = 227) completed a comprehensive neuropsychological assessment battery on the Vienna Test System (VTS; CFADHD). Test performance allows the computation of 17 embedded performance validity indicators (PVTs) derived from eight different neuropsychological tests. Further, all participants completed several self- and other-report symptom rating scales assessing depressive symptoms and cognitive functioning. The Conners' Adult ADHD Rating Scale and the Beck Depression Inventory-II were administered to derive embedded symptom validity measures (SVTs). (4) Results and conclusion: Noncredible performance occurs in a sizeable proportion of about 10% up to 30% of individuals throughout the entire battery. Tests for attention and concentration appear to be the most adequate and sensitive for detecting underperformance. Cognitive underperformance represents a coherent construct and seems dissociable from symptom overreporting. These results emphasize the importance of performing multiple PVTs, at different time points, and promote more accurate calculation of the positive and negative predictive values of a given validity measure for noncredible performance during clinical assessments. Future studies should further examine whether and how the present results stand in other clinical populations, by implementing rigorous reference standards of noncredible performance, characterizing those failing PVT assessments, and differentiating between underlying motivations.
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- 2023
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39. Networks of Neuropsychological Functions in the Clinical Evaluation of Adult ADHD.
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Guo N, Fuermaier ABM, Koerts J, Tucha O, Scherbaum N, and Müller BW
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- Humans, Adult, Neuropsychological Tests, Attention Deficit Disorder with Hyperactivity diagnosis, Attention Deficit Disorder with Hyperactivity psychology, Cognitive Dysfunction diagnosis
- Abstract
This study applied network analysis to explore the relations between neuropsychological functions of individuals in the clinical evaluation of attention-deficit/hyperactivity disorder (ADHD) in adulthood. A total of 319 participants from an outpatient referral context, that is, 173 individuals with ADHD (ADHD group) and 146 individuals without ADHD (n-ADHD group), took part in this study and completed a comprehensive neuropsychological assessment. A denser network with stronger global connectivity was observed in the ADHD group compared to the n-ADHD group. The strongest connections were consistent in both networks, that is, the connections between selective attention and vigilance, and connections between processing speed, fluency, and flexibility. Further centrality estimation revealed attention-related variables to have the highest expected influence in both networks. The observed relationships between neuropsychological functions, and the high centrality of attention, may help identify neuropsychological profiles that are specific to ADHD and optimize neuropsychological assessment and treatment planning of individuals with cognitive impairment.
- Published
- 2023
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40. Long-term improvements in executive functions after frontal-midline theta neurofeedback in a (sub)clinical group.
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Smit D, Dapor C, Koerts J, Tucha OM, Huster RJ, and Enriquez-Geppert S
- Abstract
Impairments in executive functions (EFs) are common across disorders and can greatly affect daily functioning. Frontal-midline (FM) theta neurofeedback (NF) has been shown effective in enhancing EFs in healthy adults, prompting interest in exploring its potential as an alternative treatment for EFs in (sub)clinical samples. This study aims to determine the effects of FM theta NF on EFs in a sample of 58 adults (aged 20-60 years) with pronounced subjective EF complaints in daily life. Using a pre/post/follow-up design with a sham NF group, the present study assessed upregulation of FM theta in an eight-session individualized FM theta NF training and its immediate and long-term transfer effects on objective and subjective measures of EFs. These included behavioral performance on EF tasks assessing working memory updating (N-back task), set-shifting (Switching task), conflict monitoring (Stroop task), and response inhibition (Stop-signal task), as well as FM theta power during these tasks, and subjective EFs in daily life (BRIEF-A). The results indicate that there are only differences in FM theta self-upregulation between the NF group and sham group when non-responders are excluded from the analysis. Regarding behavioral transfer effects, NF-specific improvements are found in working memory updating reaction time (RT) and conflict monitoring RT variability at 6-month follow-up, but not immediately after the NF training. The effects on FM theta power during the EF tasks and subjective changes in EFs in daily life were not specific to the NF training. As a next step, research should identify the best predictors to stratify NF training, as well as explore ways to improve NF responsiveness, for instance by increasing neuroplasticity., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Smit, Dapor, Koerts, Tucha, Huster and Enriquez-Geppert.)
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- 2023
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41. Risky Decision-Making in Adults with Alcohol Use Disorder-A Systematic and Meta-Analytic Review.
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Ariesen AD, Neubert JH, Gaastra GF, Tucha O, and Koerts J
- Abstract
Alcohol use disorder (AUD) forms a major health concern and is the most common substance use disorder worldwide. The behavioural and cognitive deficits associated with AUD have often been related to impairments in risky decision-making. The aim of this study was to examine the magnitude and type of risky decision-making deficits of adults with AUD, as well as to explore the potential mechanisms behind these deficits. To this end, existing literature comparing risky decision-making task performance of an AUD group to a control group (CG) was systematically searched and analysed. A meta-analysis was performed to address overall effects. In total, 56 studies were included. In the majority of studies (i.e., 68%), the performance of the AUD group(s) deviated from the CG(s) on one or more of the adopted tasks, which was confirmed by a small to medium pooled effect size (Hedges' g = 0.45). This review therefore provides evidence of increased risk taking in adults with AUD as compared to CGs. The increased risk taking may be due to deficits in affective and deliberative decision-making. Making use of ecologically valid tasks, future research should investigate whether risky decision-making deficits predate and/or are consequential to the addiction of adults with AUD.
- Published
- 2023
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42. Strengths and Weaknesses of Everyday Financial Knowledge and Judgment Skills of Adults with ADHD.
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Koerts J, Bangma DF, Mette C, Tucha L, and Tucha O
- Subjects
- Adult, Humans, Child, Adolescent, Judgment, Income, Attention Deficit Disorder with Hyperactivity psychology, Mentoring
- Abstract
Adequate financial capability is crucial in everyday life. This capability might, however, not be given to adults with ADHD. The present study aims to determine strengths and weaknesses regarding everyday financial knowledge and judgment skills in adults with ADHD. In addition, the impact of income is explored. Forty-five adults with ADHD (M
age = 36.6, SDage = 10.2) and 47 adults without ADHD (Mage = 38.5, SDage = 13.0) were included and were assessed with the Financial Competence Assessment Inventory. Adults with ADHD showed decreased scores regarding awareness of the arrival of bills, knowledge of own income, having a reserve fund for unexpected expenses, the ability to state long-term financial goals, own preferences for estate management, understanding of assets, legal action for debt, access to financial advice/counseling, and the ability to compare medical insurance plans as compared with adults without ADHD (all p < 0.001). However, no effect of income was found. In conclusion, adults with ADHD have difficulties with many aspects of everyday financial knowledge and skills, which might result in a plethora of personal and legal consequences. It is, therefore, of the utmost importance that professionals who support adults with ADHD proactively ask about everyday financial functioning so that assessment, financial support, and coaching can be provided.- Published
- 2023
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43. Low-Frequency Noise: Experiences from a Low-Frequency Noise Perceiving Population.
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Erdélyi KH, Fuermaier ABM, Tucha L, Tucha O, and Koerts J
- Subjects
- Adult, Humans, Cross-Sectional Studies, Employment, Noise, Hearing
- Abstract
Although low-frequency noise (LFN) is associated with various complaints, there is still much unknown about this phenomenon. This research aims to provide an extensive description of (1) LFN perceptions, (2) LFN-related complaints, and (3) the characteristics of LFN complainants. In an explorative observational cross-sectional survey study, a sample of Dutch adults reporting to experience LFN (n = 190) and a group not experiencing LFN (n = 371) completed a comprehensive questionnaire. Descriptions of LFN perceptions varied individually and were dependent on different circumstances, although some common patterns were observed. Complaints were wide-ranging and individual, with a reported high impact on daily living. Common complaints included sleeping difficulties, fatigue, or annoyance. Societal consequences were described regarding housing, work, and relationships. Attempts to stop or escape the perception were manifold but often unsuccessful. The LFN sample differed regarding sex, education level, and age from the Dutch adult population, indicating more frequent inability to work, less full-time work, and less years lived in their homes. No further differences in occupational or marital status or living circumstances were found. Although this research supports some previous findings and identifies common patterns, it also highlights the individual nature of LFN-related experiences and the heterogeneity of this group. It is advised to pay attention to the complaints of affected individuals, to inform concerned authorities, and to conduct more systematic and multidisciplinary research using standardized and validated measuring instruments.
- Published
- 2023
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44. The lncRNA KTN1-AS1 co-regulates a variety of Myc-target genes and enhances proliferation of Burkitt lymphoma cells.
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Winkle M, Tayari MM, Kok K, Duns G, Grot N, Kazimierska M, Seitz A, de Jong D, Koerts J, Diepstra A, Dzikiewicz-Krawczyk A, Steidl C, Kluiver J, and van den Berg A
- Subjects
- Humans, Gene Expression Regulation, Neoplastic, Cell Line, Tumor, Cell Proliferation genetics, Cholesterol, Membrane Proteins genetics, RNA, Long Noncoding genetics, RNA, Long Noncoding metabolism, Burkitt Lymphoma genetics, Burkitt Lymphoma metabolism, Burkitt Lymphoma pathology, Lymphoma, B-Cell
- Abstract
Long non-coding RNAs (lncRNAs) are involved in many normal and oncogenic pathways through a diverse repertoire of transcriptional and posttranscriptional regulatory mechanisms. LncRNAs that are under tight regulation of well-known oncogenic transcription factors such as c-Myc (Myc) are likely to be functionally involved in their disease-promoting mechanisms. Myc is a major driver of many subsets of B cell lymphoma and to date remains an undruggable target. We identified three Myc-induced and four Myc-repressed lncRNAs by use of multiple in vitro models of Myc-driven Burkitt lymphoma and detailed analysis of Myc binding profiles. We show that the top Myc-induced lncRNA KTN1-AS1 is strongly upregulated in different types of B cell lymphoma compared with their normal counterparts. We used CRISPR-mediated genome editing to confirm that the direct induction of KTN1-AS1 by Myc is dependent on the presence of a Myc E-box-binding motif. Knockdown of KTN1-AS1 revealed a strong negative effect on the growth of three BL cell lines. Global gene expression analysis upon KTN1-AS1 depletion shows a strong enrichment of key genes in the cholesterol biosynthesis pathway as well as co-regulation of many Myc-target genes, including a moderate negative effect on the levels of Myc itself. Our study suggests a critical role for KTN1-AS1 in supporting BL cell growth by mediating co-regulation of a variety of Myc-target genes and co-activating key genes involved in cholesterol biosynthesis. Therefore, KTN1-AS1 may represent a putative novel therapeutic target in lymphoma., (© The Author(s) 2022. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)
- Published
- 2022
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45. Stability of Attention Performance of Adults with ADHD over Time: Evidence from Repeated Neuropsychological Assessments in One-Month Intervals.
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Guo N, Koerts J, Tucha L, Fetter I, Biela C, König M, Bossert M, Diener C, Aschenbrenner S, Weisbrod M, Tucha O, and Fuermaier ABM
- Subjects
- Adult, Humans, Neuropsychological Tests, Attention, Attention Deficit Disorder with Hyperactivity psychology
- Abstract
Neuropsychological assessments of attention are valuable sources of information in the clinical evaluation of adults with attention-deficit/hyperactivity disorder (ADHD). However, it is unclear whether the attention performance of adults with ADHD is stable or fluctuates over time, which is of great importance in the interpretation of clinical assessments. This study aimed to explore the stability of attention performance of adults with ADHD in repeated assessments at one-month intervals. Twenty-one adults diagnosed with ADHD took part in this study by completing selective attention and vigilance tests three times, each one month apart. Test scores of participants were compared with and interpreted based on test norms. A considerable proportion of 'below average' performance scores were observed in most of the variables of selective attention and vigilance in all three assessments. Further, selective attention and vigilance performance scores did not differ significantly between the three repeated assessments. Finally, the majority of participants received consistent test score interpretations across the three repeated assessments. This study confirms previous research and highlights abnormal selective attention and vigilance performance in adults with ADHD. Further, this study preliminarily demonstrates relatively stable attention performance across repeated assessments, which has the potential to support clinical assessment, treatment planning, and evaluation.
- Published
- 2022
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46. The Role of the MYC/miR-150/MYB/ZDHHC11 Network in Hodgkin Lymphoma and Diffuse Large B-Cell Lymphoma.
- Author
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Ziel-Swier LJYM, Liu Y, Seitz A, de Jong D, Koerts J, Rutgers B, Veenstra R, Razak FRA, Dzikiewicz-Krawczyk A, van den Berg A, and Kluiver J
- Subjects
- Cell Proliferation, Humans, Burkitt Lymphoma genetics, Burkitt Lymphoma pathology, Hodgkin Disease genetics, Lymphoma, Large B-Cell, Diffuse genetics, Lymphoma, Large B-Cell, Diffuse metabolism, Lymphoma, Large B-Cell, Diffuse pathology, MicroRNAs genetics
- Abstract
We previously described involvement of the MYC/miR-150/MYB/ZDHHC11 network in the growth of Burkitt lymphoma (BL) cells. Here we studied the relevance of this network in the two other B-cell lymphomas: Hodgkin lymphoma (HL) and diffuse large B-cell lymphoma (DLBCL). Expression levels of the network components were assessed at the RNA and protein level. The effect of modulating levels of the network components on cell growth was determined through GFP competition assay. AGO2-RNA immunoprecipitation was performed to validate targeting by miR-150. Expression levels of MYC, MYB and ZDHHC11 were increased, while miR-150 levels were decreased similar to the pattern observed in BL. The knockdown of MYC, MYB and ZDHHC11 decreased the growth of HL and DLBCL cells. In contrast, overexpression of miR-150 did not induce clear phenotypes in HL, and limited the effects in DLBCL. This could not be explained by the differences in overexpression levels. Furthermore, we showed that in HL, ZDHHC11 and MYB are efficiently targeted by miR-150. To conclude, MYC, MYB and ZDHHC11 are critical for the growth of HL and DLBCL cells consistent with the role observed in BL cells, while low endogenous miR-150 levels appeared to be less critical for the growth of HL and DLBCL cells despite the effective targeting of ZDHHC11 and MYB.
- Published
- 2022
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47. How well do people living with neurodegenerative diseases manage their finances? A meta-analysis and systematic review on the capacity to make financial decisions in people living with neurodegenerative diseases.
- Author
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Bangma DF, Tucha O, Tucha L, De Deyn PP, and Koerts J
- Subjects
- Cognition, Humans, Reproducibility of Results, Alzheimer Disease, Cognitive Dysfunction, Huntington Disease, Neurodegenerative Diseases
- Abstract
Self and proxy reported questionnaires indicate that people living with a neurodegenerative disease (NDD) have more difficulties with financial decision-making (FDM) than healthy controls. Self-reports, however, rely on adequate insight into everyday functioning and might, therefore, be less reliable. The present study provides a comprehensive overview and meta-analysis of studies evaluating FDM in people living with an NDD. For this, the reliability of performance-based tests to consistently identify FDM difficulties in people living with an NDD compared to healthy controls is evaluated. Furthermore, the associations between FDM and disease severity, performances on standard measures of cognition and demographics are evaluated. All 47 included articles, consistently reported lower performances on performance-based FDM tests of people living with an NDD (including Alzheimer's disease, mild cognitive impairment, frontotemporal dementia, Parkinson's disease, multiple sclerosis or Huntington's disease) compared to healthy controls. The majority of studies, however, focused on Alzheimer's disease and mild cognitive impairment (k = 38). FDM performance appears to be related to cognitive decline, specifically in working memory, processing speed and numeracy., (Copyright © 2021 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2021
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48. Financial judgment determination in adults with ADHD.
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Koerts J, Bangma DF, Fuermaier ABM, Mette C, Tucha L, and Tucha O
- Subjects
- Adult, Decision Making, Humans, Attention Deficit Disorder with Hyperactivity, Judgment
- Abstract
ADHD has a debilitating influence on everyday functioning, including the capability to make financial decisions. The capability to make financial decisions is a multidimensional construct that includes financial knowledge, financial judgment, financial performance and related contextual factors. So far, the majority of studies in adults with ADHD focused on financial performance, while the other aspects of financial capability were less explored. The current study aims to partly bridge this gap by examining the ability of financial judgment in adults with ADHD. Thirty-nine adults with ADHD and 83 adults without ADHD were included. All participants were assessed with the Financial Competence Assessment Inventory (FCAI) and Financial Decision-Making Interview (FDMI) which both assess the four abilities of financial judgment, i.e., understanding, appreciation, reasoning and communication. The results show that adults with ADHD, compared to adults without ADHD, obtained significantly lower scores on understanding (according to the FCAI and FDMI). Furthermore, adults with ADHD showed a significantly lower appreciation, reasoning and communication (according to the FCAI) than adults without ADHD. In conclusion, adults with ADHD have difficulties with financial judgment especially with the ability to understand information that is relevant for a financial situation or transaction. Furthermore, adults with ADHD were found to have problems with appreciating, reasoning and communicating about practical information that partly relates to their own financial situation (as assessed with the FCAI). A careful assessment of financial capability in adults with ADHD, therefore, appears warranted in clinical practice., (© 2021. The Author(s).)
- Published
- 2021
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49. Feigning ADHD and stimulant misuse among Dutch university students.
- Author
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Fuermaier ABM, Tucha O, Koerts J, Tucha L, Thome J, and Faltraco F
- Subjects
- Humans, Students, Universities, Attention Deficit Disorder with Hyperactivity drug therapy, Attention Deficit Disorder with Hyperactivity epidemiology, Central Nervous System Stimulants therapeutic use, Substance-Related Disorders epidemiology
- Abstract
The increasing number of university students seeking diagnosis of attention-deficit/hyperactivity disorder (ADHD), and findings of an increased stimulant misuse among university students, has raised concerns regarding the credibility of the symptoms of those students. However, most of our current knowledge refers to university students in North America and less is known about this issue on European campuses. The present survey aimed to collect opinions on feigning ADHD and to estimate the prevalence of stimulant misuse among 1071 university students in the Netherlands. The majority of students expressed liberal attitudes towards feigning ADHD. Also, a substantial number of respondents considered feigning ADHD themselves or know someone who feigns ADHD. Furthermore, 68% of students assumed benefits of taking stimulants without prescription and 16% have indeed already taken stimulants without prescription. Feigning ADHD and misuse of prescription medication are prevalent issues among Dutch students. The results underline the need for a careful diagnostic evaluation of individuals for ADHD. Furthermore, efforts are required in order to prevent stimulant drug trafficking and misuse among university students., (© 2021. The Author(s).)
- Published
- 2021
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50. Neuropsychological functioning of individuals at clinical evaluation of adult ADHD.
- Author
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Guo N, Fuermaier ABM, Koerts J, Mueller BW, Diers K, Mroß A, Mette C, Tucha L, and Tucha O
- Subjects
- Adult, Cognition, Diagnosis, Differential, Humans, Neuropsychological Tests, Retrospective Studies, Attention Deficit Disorder with Hyperactivity diagnosis
- Abstract
Objectives: Numerous studies showed that adults with attention deficit hyperactivity disorder (ADHD) suffer from impairments in a range of cognitive functions when compared to healthy controls. However, only little is known about the neuropsychological functions when compared to various clinical control groups and whether a distinct neuropsychological profile can be identified for adult ADHD., Method: This retrospective study examined data of 199 outpatients referred for clinical evaluation of adult ADHD, allocated either to an ADHD group (n = 78) or to one of two clinical comparison groups, depending on whether they show indications (n = 71) or no indications (n = 50) for the presence of psychiatric disorders other than ADHD. All individuals performed a comprehensive neuropsychological test battery., Results: Data analysis revealed impairments in a range of cognitive functions in a substantial number of patients of all three groups. However, profiles of neuropsychological impairments were similar between groups. Furthermore, significant small- to medium-sized correlations between basic and higher-order cognitive functions were revealed in the ADHD group and the clinical comparison group with indications for psychiatric disorders other than ADHD., Conclusion: Neuropsychological impairments are prominent in psychiatric outpatients seeking a clinical evaluation of adult ADHD but are not specific for ADHD. It is concluded that neuropsychological test performance may have limited incremental value to support the psychiatric differential diagnosis. Furthermore, a clinical trajectory may need to take into account that deficits in a range of higher-order cognitive functions can be substantially explained by deficits in basic cognitive functions., (© 2020. The Author(s).)
- Published
- 2021
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