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1. Estimating Likelihood of Dementia in the Absence of Diagnostic Data: A Latent Dementia Index in 10 Genetically Informed Studies

Author

Beam, Christopher R, Luczak, Susan E, Panizzon, Matthew S, Reynolds, Chandra A, Christensen, Kaare, Aslan, Anna K Dahl, Elman, Jeremy A, Franz, Carol E, Kremen, William S, Lee, Teresa, Nygaard, Marianne, Sachdev, Perminder S, Whitfield, Keith E, Pedersen, Nancy L, Gatz, Margaret, and Consortium, for the IGEMS

Subjects
Biological Psychology, Psychology, Dementia, Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD), Brain Disorders, Neurodegenerative, Clinical Research, Aging, Acquired Cognitive Impairment, Alzheimer's Disease, Neurological, Humans, Activities of Daily Living, Probability, genetic correlation, harmonization, latent index, twin study, IGEMS Consortium, quality of life, Clinical Sciences, Neurosciences, Cognitive Sciences, Neurology & Neurosurgery, Clinical sciences, Biological psychology
Abstract

BackgroundEpidemiological research on dementia is hampered by differences across studies in how dementia is classified, especially where clinical diagnoses of dementia may not be available.ObjectiveWe apply structural equation modeling to estimate dementia likelihood across heterogeneous samples within a multi-study consortium and use the twin design of the sample to validate the results.MethodsUsing 10 twin studies, we implement a latent variable approach that aligns different tests available in each study to assess cognitive, memory, and functional ability. The model separates general cognitive ability from components indicative of dementia. We examine the validity of this continuous latent dementia index (LDI). We then identify cut-off points along the LDI distributions in each study and align them across studies to distinguish individuals with and without probable dementia. Finally, we validate the LDI by determining its heritability and estimating genetic and environmental correlations between the LDI and clinically diagnosed dementia where available.ResultsResults indicate that coordinated estimation of LDI across 10 studies has validity against clinically diagnosed dementia. The LDI can be fit to heterogeneous sets of memory, other cognitive, and functional ability variables to extract a score reflective of likelihood of dementia that can be interpreted similarly across studies despite diverse study designs and sampling characteristics. Finally, the same genetic sources of variance strongly contribute to both the LDI and clinical diagnosis.ConclusionThis latent dementia indicator approach may serve as a model for other research consortia confronted with similar data integration challenges.

Published
2022

2. Genetic and environmental influences on human height from infancy through adulthood at different levels of parental education

Author

Jelenkovic, Aline, Sund, Reijo, Yokoyama, Yoshie, Latvala, Antti, Sugawara, Masumi, Tanaka, Mami, Matsumoto, Satoko, Freitas, Duarte L, Maia, José Antonio, Knafo-Noam, Ariel, Mankuta, David, Abramson, Lior, Ji, Fuling, Ning, Feng, Pang, Zengchang, Rebato, Esther, Saudino, Kimberly J, Cutler, Tessa L, Hopper, John L, Ullemar, Vilhelmina, Almqvist, Catarina, Magnusson, Patrik KE, Cozen, Wendy, Hwang, Amie E, Mack, Thomas M, Nelson, Tracy L, Whitfield, Keith E, Sung, Joohon, Kim, Jina, Lee, Jooyeon, Lee, Sooji, Llewellyn, Clare H, Fisher, Abigail, Medda, Emanuela, Nisticò, Lorenza, Toccaceli, Virgilia, Baker, Laura A, Tuvblad, Catherine, Corley, Robin P, Huibregtse, Brooke M, Derom, Catherine A, Vlietinck, Robert F, Loos, Ruth JF, Burt, S Alexandra, Klump, Kelly L, Silberg, Judy L, Maes, Hermine H, Krueger, Robert F, McGue, Matt, Pahlen, Shandell, Gatz, Margaret, Butler, David A, Harris, Jennifer R, Brandt, Ingunn, Nilsen, Thomas S, Harden, K Paige, Tucker-Drob, Elliot M, Franz, Carol E, Kremen, William S, Lyons, Michael J, Lichtenstein, Paul, Bartels, Meike, Beijsterveldt, Catharina EM van, Willemsen, Gonneke, Öncel, Sevgi Y, Aliev, Fazil, Jeong, Hoe-Uk, Hur, Yoon-Mi, Turkheimer, Eric, Boomsma, Dorret I, Sørensen, Thorkild IA, Kaprio, Jaakko, and Silventoinen, Karri

Subjects
Biological Psychology, Health Sciences, Psychology, Pediatric, Nutrition, Genetics, Prevention, 2.1 Biological and endogenous factors, Aetiology, Quality Education, Adolescent, Adult, Body Height, Child, Child, Preschool, Environment, Female, Gene-Environment Interaction, Genetic Background, Humans, Infant, Infant, Newborn, Male, Parenting, Parents, Quantitative Trait Loci, Quantitative Trait, Heritable, Young Adult
Abstract

Genetic factors explain a major proportion of human height variation, but differences in mean stature have also been found between socio-economic categories suggesting a possible effect of environment. By utilizing a classical twin design which allows decomposing the variation of height into genetic and environmental components, we tested the hypothesis that environmental variation in height is greater in offspring of lower educated parents. Twin data from 29 cohorts including 65,978 complete twin pairs with information on height at ages 1 to 69 years and on parental education were pooled allowing the analyses at different ages and in three geographic-cultural regions (Europe, North America and Australia, and East Asia). Parental education mostly showed a positive association with offspring height, with significant associations in mid-childhood and from adolescence onwards. In variance decomposition modeling, the genetic and environmental variance components of height did not show a consistent relation to parental education. A random-effects meta-regression analysis of the aggregate-level data showed a trend towards greater shared environmental variation of height in low parental education families. In conclusion, in our very large dataset from twin cohorts around the globe, these results provide only weak evidence for the study hypothesis.

Published
2020

3. Risk Factor Burden, Heart Failure, and Survival in Women of Different Ethnic Groups: Insights From the Women's Health Initiative.

Author

Breathett, Khadijah, Leng, Iris, Foraker, Randi E, Abraham, William T, Coker, Laura, Whitfield, Keith E, Shumaker, Sally, Manson, JoAnn E, Eaton, Charles B, Howard, Barbara V, Ijioma, Nkechinyere, Cené, Crystal W, Martin, Lisa W, Johnson, Karen C, and Klein, Liviu

Subjects
Humans, Proportional Hazards Models, Risk Factors, Survival Analysis, Aged, Middle Aged, African Americans, Women's Health, Female, Heart Failure, Ethnicity, Racial Groups, ethnic groups, heart failure, risk factors, survival, women, Cardiovascular, Heart Disease, Prevention, Clinical Research, Cardiovascular System & Hematology, Biochemistry and Cell Biology, Cardiorespiratory Medicine and Haematology, Medical Physiology
Abstract

BackgroundThe higher risk of heart failure (HF) in African-American and Hispanic women compared with white women is related to the higher burden of risk factors (RFs) in minorities. However, it is unclear if there are differences in the association between the number of RFs for HF and the risk of development of HF and death within racial/ethnic groups.Methods and resultsIn the WHI (Women's Health Initiative; 1993-2010), African-American (n=11 996), white (n=18 479), and Hispanic (n=5096) women with 1, 2, or 3+ baseline RFs were compared with women with 0 RF within their respective racial/ethnic groups to assess risk of developing HF or all-cause mortality before and after HF, using survival analyses. After adjusting for age, socioeconomic status, and hormone therapy, the subdistribution hazard ratio (95% confidence interval) of developing HF increased as number of RFs increased (P

Published
2018

4. The Employer Potential of MOOCs: A Mixed-Methods Study of Human Resource Professionals' Thinking on MOOCs

Author

Radford, Alexandria Walton, Robles, Jessica, Cataylo, Stacey, Horn, Laura, Thornton, Jessica, and Whitfield, Keith E.

Abstract

While press coverage of MOOCs (massive open online courses) has been considerable and major MOOC providers are beginning to realize that employers may be a market for their courses, research on employers' receptivity to using MOOCs is scarce. To help fill this gap, the Finding and Developing Talent study surveyed 103 employers and interviewed a subset of 20 about their awareness of MOOCs and their receptivity to using MOOCs in recruiting, hiring, and professional development. Results showed that though awareness of MOOCs was relatively low (31% of the surveyed employers had heard of MOOCs), once they understood what they were, the employers perceived MOOCs positively in hiring decisions, viewing them mainly as indicating employees' personal attributes like motivation and a desire to learn. A majority of employers (59%) were also receptive to using MOOCs for recruiting purposes--especially for staff with technical skills in high demand. Yet an even higher percentage (83%) were using, considering using, or could see their organization using MOOCs for professional development. Interviews with employers suggested that obtaining evidence about the quality of MOOCs, including the long-term learning and work performance gains that employees accrue from taking them, would increase employers' use of MOOCs not just in professional development but also in recruiting and hiring.

Published
2014

10. The effect of stress and acculturation on the self-rated health of Arab Americans

Author

Suleiman, Abdul-Rahman M., Javanbakht, Arash, and Whitfield, Keith E.

Subjects
stress, detroit metropolitan area, Arab American, Original Article, Acculturation, self-rated health
Abstract

BACKGROUND: The self-rated health of Arab Americans has been found to be worse than non-Hispanic whites. Psychosocial factors such as stress and acculturation may explain this disparity. As a result, we designed this survey to better understand the effects of stress and acculturation on the self-rated health of the Arab-American community. MATERIALS AND METHODS: Using a convenience sample, we surveyed 142 self-identified Arab Americans regarding demographics, stress, acculturation, and self-rated health. Stress was measured using instruments assessing perceived stress, everyday discrimination, and acculturative stress. Acculturation was measured using a modified Vancouver Index of Acculturation. To measure self-rated health, participants were asked to rate their current health on a scale of 1 (very poor) to 5 (very good). RESULTS: A logistic regression model adjusted for age, sex, body mass index, and education did not find that stress significantly affected the odds of having poor self-rated health in Arab Americans. Heritage identity was associated with lower odds of having poor self-rated health (odds ratio = 0.37, 95% confidence interval [CI] 0.15, 0.94, P < 0.05). No association was found between acculturation and poor self-rated health. CONCLUSION: Greater levels of stress were not significantly associated with greater odds of poor self-rated health in Arab Americans. We also found that greater heritage identity significantly decreased the odds of poor self-rated health in Arab Americans. The effects of everyday discrimination, perceived stress, and acculturation on self-rated health in Arab Americans remain unclear and need to be examined further.

Published
2021

11. Religious service attendance and mortality among older Black men

Author

Bruce, Marino A., primary, Beech, Bettina M., additional, Kermah, Dulcie, additional, Bailey, Shanelle, additional, Phillips, Nicole, additional, Jones, Harlan P., additional, Bowie, Janice V., additional, Heitman, Elizabeth, additional, Norris, Keith C., additional, Whitfield, Keith E., additional, and Thorpe, Roland J., additional

Published
2022
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12. Association between birthweight and later body mass index: an individual-based pooled analysis of 27 twin cohorts participating in the CODATwins project

Author

Jelenkovic, Aline, Yokoyama, Yoshie, Sund, Reijo, Pietiläinen, Kirsi H, Hur, Yoon-Mi, Willemsen, Gonneke, Bartels, Meike, van Beijsterveldt, Toos CEM, Ooki, Syuichi, Saudino, Kimberly J, Stazi, Maria A, Fagnani, Corrado, D’Ippolito, Cristina, Nelson, Tracy L, Whitfield, Keith E, Knafo-Noam, Ariel, Mankuta, David, Abramson, Lior, Heikkilä, Kauko, Cutler, Tessa L, Hopper, John L, Wardle, Jane, Llewellyn, Clare H, Fisher, Abigail, Corley, Robin P, Huibregtse, Brooke M, Derom, Catherine A, Vlietinck, Robert F, Loos, Ruth JF, Bjerregaard-Andersen, Morten, Beck-Nielsen, Henning, Sodemann, Morten, Tarnoki, Adam D, Tarnoki, David L, Burt, S Alexandra, Klump, Kelly L, Ordoñana, Juan R, Sánchez-Romera, Juan F, Colodro-Conde, Lucia, Dubois, Lise, Boivin, Michel, Brendgen, Mara, Dionne, Ginette, Vitaro, Frank, Harris, Jennifer R, Brandt, Ingunn, Nilsen, Thomas Sevenius, Craig, Jeffrey M, Saffery, Richard, Rasmussen, Finn, Tynelius, Per, Bayasgalan, Gombojav, Narandalai, Danshiitsoodol, Haworth, Claire MA, Plomin, Robert, Ji, Fuling, Ning, Feng, Pang, Zengchang, Rebato, Esther, Krueger, Robert F, McGue, Matt, Pahlen, Shandell, Boomsma, Dorret I, Sørensen, Thorkild IA, Kaprio, Jaakko, and Silventoinen, Karri

Published
2017
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14. Estimating Likelihood of Dementia in the Absence of Diagnostic Data : A Latent Dementia Index in 10 Genetically Informed Studies

Author

Beam, Christopher R., Luczak, Susan E., Panizzon, Matthew S., Reynolds, Chandra A., Christensen, Kaare, Dahl Aslan, Anna K., Elman, Jeremy A., Franz, Carol E., Kremen, William S., Lee, Teresa, Nygaard, Marianne, Sachdev, Perminder S., Whitfield, Keith E., Pedersen, Nancy L., and Gatz, Margaret

Subjects
General Neuroscience, General Medicine, psychology, daily life activity, genetic correlation, Psychiatry and Mental health, Clinical Psychology, quality of life, harmonization, Activities of Daily Living, Humans, Dementia, genetics, Gerontologi, medicinsk/hälsovetenskaplig inriktning, human, latent index, Gerontology, specialising in Medical and Health Sciences, Geriatrics and Gerontology, twin study, Probability
Abstract

BACKGROUND: Epidemiological research on dementia is hampered by differences across studies in how dementia is classified, especially where clinical diagnoses of dementia may not be available. OBJECTIVE: We apply structural equation modeling to estimate dementia likelihood across heterogeneous samples within a multi-study consortium and use the twin design of the sample to validate the results. METHODS: Using 10 twin studies, we implement a latent variable approach that aligns different tests available in each study to assess cognitive, memory, and functional ability. The model separates general cognitive ability from components indicative of dementia. We examine the validity of this continuous latent dementia index (LDI). We then identify cut-off points along the LDI distributions in each study and align them across studies to distinguish individuals with and without probable dementia. Finally, we validate the LDI by determining its heritability and estimating genetic and environmental correlations between the LDI and clinically diagnosed dementia where available. RESULTS: Results indicate that coordinated estimation of LDI across 10 studies has validity against clinically diagnosed dementia. The LDI can be fit to heterogeneous sets of memory, other cognitive, and functional ability variables to extract a score reflective of likelihood of dementia that can be interpreted similarly across studies despite diverse study designs and sampling characteristics. Finally, the same genetic sources of variance strongly contribute to both the LDI and clinical diagnosis. CONCLUSION: This latent dementia indicator approach may serve as a model for other research consortia confronted with similar data integration challenges. CC BY-NC 4.0© 2022 – The authors. Published by IOS Press.Correspondence to: Margaret Gatz, Center for Economic and Social Research, University of Southern California, Los Angeles, CA, USA. Tel.: +1 213 740 2212; E-mail: gatz@usc.edu.Membership of the IGEMS consortium is provided at https://dornsife.usc.edu/labs/IGEMSThis work was supported by US National Institutes of Health (NIH) grants R01 AG060470 to MG and NLP and RF1 AG058068 to Pike, LaDu, and MG and a grant from the Alzheimer’s Association (AARF-17-505302) to CRB. HARMONY was supported by NIH grant R01AG08724 to MG. SATSA was supported by grants NIH R01 AG04563, R01 AG10175, the John D. and Catherine T. MacArthur Foundation Research Network on Successful Aging, the Swedish Council For Working Life and Social Research (FAS) (97:0147:1B, 2009-0795), and the Swedish Research Council (825-2007-7460, 825-2009-6141) to NLP. GENDER was supported by the MacArthur Foundation Research Network on Successful Aging to McClearn and The Axel and Margaret Ax:son Johnson’s Foundation, The Swedish Council for Social Research, and the Swedish Foundation for Health Care Sciences and Allergy Research to Malmberg. OCTO-Twin was supported by grant NIH R01 AG08861 to McClearn. OATS was funded by a National Health & Medical Research Council and Australian Research Council Strategic Award Grant of the Ageing Well, Ageing Productively Program (ID No. 401162), and NHMRC Project Grants (ID 1045325 and 1085606) to PS. OATS participant recruitment was facilitated through Twins Research Australia, a national resource in part supported by a Centre for Research Excellence Grant (ID: 1079102), from the National Health and Medical Research Council. We also acknowledge the contribution to this study of the OATS research team listed at https://cheba.unsw.edu.au/project/older-australian-twins-study. The Danish Twin Registry was supported by grants from The National Program for Research Infrastructure 2007 from the Danish Agency for Science and Innovation, the Velux Foundation, and NIH grant P01 AG08761 to Vaupeland KC. CAATSA was funded by NIH grant R01AG13662 to KEW. MIDUS was supported bythe John D. and Catherine T. MacArthur Foundation Research Network on Successful Midlife Development and by NIH grant P01 AG20166 to Ryff. VETSA was supported by NIH grants R01AG050595 and R01 AG022381 to WSK and CEF. The Cooperative Studies Program of the Office of Research & Development of the US Department of Veterans Affairs also provided financial support for the development and maintenance of the Vietnam Era Twin (VET) Registry. The content of this manuscript is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies. Authors’ disclosures available online (https://www.j-alz.com/manuscript-disclosures/22-0472r1).

Published
2022

19. Parental education and genetics of body mass index from infancy to old age: a pooled analysis of 29 twin cohorts

Author

Silventoinen, Karri, Jelenkovic, Aline, Latvala, Antti, Yokoyama, Yoshie, Sund, Reijo, Sugawara, Masumi, Tanaka, Mami, Matsumoto, Satoko, Aaltonen, Sari, Piirtola, Maarit, Freitas, Duarte L, Maia, José A, Öncel, Sevgi Y, Aliev, Fazil, Ji, Fuling, Ning, Feng, Pang, Zengchang, Rebato, Esther, Saudino, Kimberly J, Cutler, Tessa L, Hopper, John L, Ullemar, Vilhelmina, Almqvist, Catarina, Magnusson, Patrik KE, Cozen, Wendy, Hwang, Amie E, Mack, Thomas M, Willemsen, Gonneke, Bartels, Meike, van Beijsterveldt, Catharina EM, Nelson, Tracy L, Whitfield, Keith E, Sung, Joohon, Kim, Jina, Lee, Jooyeon, Lee, Sooji, Llewellyn, Clare H, Fisher, Abigail, Medda, Emanuela, Nisticò, Lorenza, Toccaceli, Virgilia, Baker, Laura A, Tuvblad, Catherine, Corley, Robin P, Huibregtse, Brooke M, Derom, Catherine A, Vlietinck, Robert F, Loos, Ruth JF, Knafo-Noam, Ariel, Mankuta, David, Abramson, Lior, Burt, S Alexandra, Klump, Kelly L, Silberg, Judy L, Maes, Hermine H, Krueger, Robert F, McGue, Matt, Pahlen, Shandell, Gatz, Margaret, Butler, David A, Harris, Jennifer R, Nilsen, Thomas S, Harden, K Paige, Tucker-Drob, Elliot M, Franz, Carol E, Kremen, William S, Lyons, Michael J, Lichtenstein, Paul, Jeong, Hoe-Uk, Hur, Yoon-Mi, Boomsma, Dorret I, Sørensen, Thorkild IA, and Kaprio, Jaakko

Subjects
Adult, Male, Parents, Adolescent, parental education, Twins, nutritional and metabolic diseases, Infant, body mass index, Middle Aged, Article, Cohort Studies, Young Adult, Child, Preschool, Humans, genetics, Female, Gene-Environment Interaction, international comparisons, Child, Aged
Abstract

Objective: To analyze how parental education modifies the genetic and environmental variances of body mass index (BMI) from infancy to old age in three geographic-cultural regions. Methods: A pooled sample of 29 cohorts including 143 499 twin individuals with information on parental education and BMI from 1 to 79 years (299 201 BMI measures) was analyzed by genetic twin modeling. Results: Until 4 years of age, parental education was not consistently associated with BMI. Thereafter, higher parental education was associated with lower BMI in males and females. Total and additive genetic variances of BMI were smaller in the offspring of highly educated parents than in those whose parents had low education. Especially in North American and Australian children, environmental factors shared by co-twins also contributed to the higher BMI variation in the low educational category. In Europe and East Asia, the associations of parental education with mean BMI and BMI variance were weaker than in North America and Australia. Conclusions: Lower parental education is associated with higher mean and larger genetic variance of BMI after early childhood, especially in the obesogenic macro-environment. The interplay between genetic predisposition, childhood social environment and macro-social context is important for socio-economic differences in BMI.

Published
2019

22. Marketing public health through older adult volunteering: Experience Corps as a social marketing intervention

Author

Tan, Erwin J., Tanner, Elizabeth K., Seeman, Teresa E., Xue, Qian-Li, Rebok, George W., Frick, Kevin D., Carlson, Michelle C., Wang, Tao, Piferi, Rachel L., McGill, Sylvia, Whitfield, Keith E., and Fried, Linda P.

Subjects
Volunteerism -- Analysis, Aged patients -- Health aspects, Aged patients -- Care and treatment, Public health -- Social aspects, Government, Health care industry
Abstract

Objectives. We present a social marketing conceptual framework for Experience Corps Baltimore City (EC) in which the desired health outcome is not the promoted product or behavior. We also demonstrate the feasibility of a social marketing-based recruitment campaign for the first year of the Baltimore Experience Corps Trial (BECT), a randomized, controlled trial of the health benefits of EC participation for older adults. Methods. We recruited older adults from the Baltimore, MD, area. Participants randomized to the intervention were placed in public schools in volunteer roles designed to increase healthy behaviors. We examined the effectiveness of a recruitment message that appealed to generativity (i.e., to make a difference for the next generation), rather than potential health benefits. Results. Among the 155 participants recruited in the first year of the BECT, the average age was 69 years; 87% were women and 85% were African American. Participants reported primarily generative motives as their reason for interest in the BECT. Conclusions. Public health interventions embedded in civic engagement have the potential to engage older adults who might not respond to a direct appeal to improve their health. (Am J Public Health. 2010;100:727-734. doi:10.2105/AJPH.2009.169151)

Published
2010

23. Special Issue: Race and Mental Health Among Older Adults: Do Depressive Symptoms Shape Blacks' Perceptions of Stress Over Time?

Author

Byrd, DeAnnah R, Thorpe, Roland J, and Whitfield, Keith E

Subjects
African Americans, Special Issue: Race and Mental Health Among Older Adults, perceived stress, depression, Original Report, age effects, AcademicSubjects/SOC02600
Abstract

Background and Objectives Previous studies have linked stress to multiple negative mental health outcomes, including depression. This established stress–depression association is typically examined in one direction and cross-sectionally. This study examined the bidirectional relationships between depressive symptoms and changes in perceived stress over time in Blacks. Research Design and Methods The present study uses a community-dwelling sample of 450 Black adults, aged 51–96 years old, who participated in the Baltimore Study of Black Aging—Patterns of Cognitive Aging. Perceived stress—measured by the Perceived Stress Scale—and depressive symptoms—measured using the Center for Epidemiologic Studies Depression scale—were both assessed at baseline and follow-up 33 months later. Ordinary least squares regression was used to examine 2 bidirectional longitudinal relationships between (1) stress–depression and (2) depression–stress, and whether these associations are modified by age. Results Initial analyses testing the typical stress–depression relationship showed an effect in the expected direction, that is stress leading to more depressive symptoms over time, adjusting for model covariates, but the effect was not statistically significant (b = 0.014, p = .642). After accounting for baseline perceived stress level, age, sex, education, and chronic health conditions, depressive symptoms were positively associated with follow-up stress (b = 0.210, p < .000). The depression–stress association further varied by age group such that the impact of baseline depression on changes in perceived stress was greatest in Blacks in their 60s versus those in their 50s (b = 0.267, p = .001), controlling for model covariates. Discussion and Implications Contrary to previous work, the results suggest that an individual’s mental health shapes his/her perception of stressful events and this relationship varies by age group. While the typical finding (stress impacting depression) was not significant, the findings reported here highlight the importance of considering the possible bidirectional nature of the relationships between psychosocial measures of stress and mental health in later life among Blacks.

Published
2019

27. Genetic and environmental variation in educational attainment: an individual-based analysis of 28 twin cohorts

Author

Silventoinen, Karri, primary, Jelenkovic, Aline, additional, Sund, Reijo, additional, Latvala, Antti, additional, Honda, Chika, additional, Inui, Fujio, additional, Tomizawa, Rie, additional, Watanabe, Mikio, additional, Sakai, Norio, additional, Rebato, Esther, additional, Busjahn, Andreas, additional, Tyler, Jessica, additional, Hopper, John L., additional, Ordoñana, Juan R., additional, Sánchez-Romera, Juan F., additional, Colodro-Conde, Lucia, additional, Calais-Ferreira, Lucas, additional, Oliveira, Vinicius C., additional, Ferreira, Paulo H., additional, Medda, Emanuela, additional, Nisticò, Lorenza, additional, Toccaceli, Virgilia, additional, Derom, Catherine A., additional, Vlietinck, Robert F., additional, Loos, Ruth J. F., additional, Siribaddana, Sisira H., additional, Hotopf, Matthew, additional, Sumathipala, Athula, additional, Rijsdijk, Fruhling, additional, Duncan, Glen E., additional, Buchwald, Dedra, additional, Tynelius, Per, additional, Rasmussen, Finn, additional, Tan, Qihua, additional, Zhang, Dongfeng, additional, Pang, Zengchang, additional, Magnusson, Patrik K. E., additional, Pedersen, Nancy L., additional, Dahl Aslan, Anna K., additional, Hwang, Amie E., additional, Mack, Thomas M., additional, Krueger, Robert F., additional, McGue, Matt, additional, Pahlen, Shandell, additional, Brandt, Ingunn, additional, Nilsen, Thomas S., additional, Harris, Jennifer R., additional, Martin, Nicholas G., additional, Medland, Sarah E., additional, Montgomery, Grant W., additional, Willemsen, Gonneke, additional, Bartels, Meike, additional, van Beijsterveldt, Catharina E. M., additional, Franz, Carol E., additional, Kremen, William S., additional, Lyons, Michael J., additional, Silberg, Judy L., additional, Maes, Hermine H., additional, Kandler, Christian, additional, Nelson, Tracy L., additional, Whitfield, Keith E., additional, Corley, Robin P., additional, Huibregtse, Brooke M., additional, Gatz, Margaret, additional, Butler, David A., additional, Tarnoki, Adam D., additional, Tarnoki, David L., additional, Park, Hang A., additional, Lee, Jooyeon, additional, Lee, Soo Ji, additional, Sung, Joohon, additional, Yokoyama, Yoshie, additional, Sørensen, Thorkild I. A., additional, Boomsma, Dorret I., additional, and Kaprio, Jaakko, additional

Published
2020
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38. Basketball free-throw performance: practice implications

Author

Kozar, Bill, Vaughn, Ross E., Lord, Russell H., and Whitfield, Keith E.

Subjects
Basketball -- Research, Athletic ability -- Research, Basketball players -- Training
Abstract

The free-throw practice technique of shooting free-throws in groupings of at least five shots may not be an effective way of improving free-throw performance in game situations. Results of a study comparing the free-throw performance of a college basketball team in practice and in actual games reveal that practice free-throw percentage is much better than game free-throw percentage. However, free-throw performance for the first two shots during practice and game performance did not vary significantly., According to many coaches, free-throw success is often the deciding factor in winning or losing a game (Palladino, 1980; Pim, 1986; Schuetzle, 1988; Schulze, 1981). Jenkins (1977) reported that in [...]

Published
1995

40. Parental Education and Genetics of BMI from Infancy to Old Age: A Pooled Analysis of 29 Twin Cohorts

Author

Silventoinen, Karri, primary, Jelenkovic, Aline, additional, Latvala, Antti, additional, Yokoyama, Yoshie, additional, Sund, Reijo, additional, Sugawara, Masumi, additional, Tanaka, Mami, additional, Matsumoto, Satoko, additional, Aaltonen, Sari, additional, Piirtola, Maarit, additional, Freitas, Duarte L., additional, Maia, José A., additional, Öncel, Sevgi Y., additional, Aliev, Fazil, additional, Ji, Fuling, additional, Ning, Feng, additional, Pang, Zengchang, additional, Rebato, Esther, additional, Saudino, Kimberly J., additional, Cutler, Tessa L., additional, Hopper, John L., additional, Ullemar, Vilhelmina, additional, Almqvist, Catarina, additional, Magnusson, Patrik K. E., additional, Cozen, Wendy, additional, Hwang, Amie E., additional, Mack, Thomas M., additional, Willemsen, Gonneke, additional, Bartels, Meike, additional, van Beijsterveldt, Catharina E. M., additional, Nelson, Tracy L., additional, Whitfield, Keith E., additional, Sung, Joohon, additional, Kim, Jina, additional, Lee, Jooyeon, additional, Lee, Sooji, additional, Llewellyn, Clare H., additional, Fisher, Abigail, additional, Medda, Emanuela, additional, Nisticò, Lorenza, additional, Toccaceli, Virgilia, additional, Baker, Laura A., additional, Tuvblad, Catherine, additional, Corley, Robin P., additional, Huibregtse, Brooke M., additional, Derom, Catherine A., additional, Vlietinck, Robert F., additional, Loos, Ruth J. F., additional, Knafo‐Noam, Ariel, additional, Mankuta, David, additional, Abramson, Lior, additional, Burt, S. Alexandra, additional, Klump, Kelly L., additional, Silberg, Judy L., additional, Maes, Hermine H., additional, Krueger, Robert F., additional, McGue, Matt, additional, Pahlen, Shandell, additional, Gatz, Margaret, additional, Butler, David A., additional, Harris, Jennifer R., additional, Nilsen, Thomas S., additional, Harden, K. Paige, additional, Tucker‐Drob, Elliot M., additional, Franz, Carol E., additional, Kremen, William S., additional, Lyons, Michael J., additional, Lichtenstein, Paul, additional, Jeong, Hoe‐Uk, additional, Hur, Yoon‐Mi, additional, Boomsma, Dorret I., additional, Sørensen, Thorkild I. A., additional, and Kaprio, Jaakko, additional

Published
2019
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42. Genetic and environmental factors affecting birth size variation: a pooled individual-based analysis of secular trends and global geographical differences using 26 twin cohorts

Author

Yokoyama, Yoshie, primary, Jelenkovic, Aline, additional, Hur, Yoon-Mi, additional, Sund, Reijo, additional, Fagnani, Corrado, additional, Stazi, Maria A, additional, Brescianini, Sonia, additional, Ji, Fuling, additional, Ning, Feng, additional, Pang, Zengchang, additional, Knafo-Noam, Ariel, additional, Mankuta, David, additional, Abramson, Lior, additional, Rebato, Esther, additional, Hopper, John L, additional, Cutler, Tessa L, additional, Saudino, Kimberly J, additional, Nelson, Tracy L, additional, Whitfield, Keith E, additional, Corley, Robin P, additional, Huibregtse, Brooke M, additional, Derom, Catherine A, additional, Vlietinck, Robert F, additional, Loos, Ruth J F, additional, Llewellyn, Clare H, additional, Fisher, Abigail, additional, Bjerregaard-Andersen, Morten, additional, Beck-Nielsen, Henning, additional, Sodemann, Morten, additional, Krueger, Robert F, additional, McGue, Matt, additional, Pahlen, Shandell, additional, Bartels, Meike, additional, van Beijsterveldt, Catharina E M, additional, Willemsen, Gonneke, additional, Harris, Jennifer R, additional, Brandt, Ingunn, additional, Nilsen, Thomas S, additional, Craig, Jeffrey M, additional, Saffery, Richard, additional, Dubois, Lise, additional, Boivin, Michel, additional, Brendgen, Mara, additional, Dionne, Ginette, additional, Vitaro, Frank, additional, Haworth, Claire M A, additional, Plomin, Robert, additional, Bayasgalan, Gombojav, additional, Narandalai, Danshiitsoodol, additional, Rasmussen, Finn, additional, Tynelius, Per, additional, Tarnoki, Adam D, additional, Tarnoki, David L, additional, Ooki, Syuichi, additional, Rose, Richard J, additional, Pietiläinen, Kirsi H, additional, Sørensen, Thorkild I A, additional, Boomsma, Dorret I, additional, Kaprio, Jaakko, additional, and Silventoinen, Karri, additional

Published
2018
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43. Birth size and gestational age in opposite-sex twins as compared to same-sex twins: An individual-based pooled analysis of 21 cohorts

Author

Jelenkovic, Aline, primary, Sund, Reijo, additional, Yokoyama, Yoshie, additional, Hur, Yoon-Mi, additional, Ullemar, Vilhelmina, additional, Almqvist, Catarina, additional, Magnusson, Patrik KE, additional, Willemsen, Gonneke, additional, Bartels, Meike, additional, Beijsterveldt, Catharina EM van, additional, Bogl, Leonie H., additional, Pietiläinen, Kirsi H, additional, Vuoksimaa, Eero, additional, Ji, Fuling, additional, Ning, Feng, additional, Pang, Zengchang, additional, Nelson, Tracy L, additional, Whitfield, Keith E., additional, Rebato, Esther, additional, Llewellyn, Clare H., additional, Fisher, Abigail, additional, Bayasgalan, Gombojav, additional, Narandalai, Danshiitsoodol, additional, Bjerregaard-Andersen, Morten, additional, Beck-Nielsen, Henning, additional, Sodemann, Morten, additional, Tarnoki, Adam D., additional, Tarnoki, David L., additional, Ooki, Syuichi, additional, Stazi, Maria A., additional, Fagnani, Corrado, additional, Brescianini, Sonia, additional, Dubois, Lise, additional, Boivin, Michel, additional, Brendgen, Mara, additional, Dionne, Ginette, additional, Vitaro, Frank, additional, Cutler, Tessa L, additional, Hopper, John L., additional, Krueger, Robert F., additional, McGue, Matt, additional, Pahlen, Shandell, additional, Craig, Jeffrey M., additional, Saffery, Richard, additional, Haworth, Claire MA, additional, Plomin, Robert, additional, Knafo-Noam, Ariel, additional, Mankuta, David, additional, Abramson, Lior, additional, Burt, S Alexandra, additional, Klump, Kelly L., additional, Vlietinck, Robert F., additional, Derom, Catherine A., additional, Loos, Ruth JF, additional, Boomsma, Dorret I., additional, Sørensen, Thorkild I. A., additional, Kaprio, Jaakko, additional, and Silventoinen, Karri, additional

Published
2018
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44. Neuropsychological assessment, neuroimaging, and neuropsychiatric evaluation in pediatric and adult patients with sickle cell disease (SCD)

Author

Edwards, Christopher L, Raynor, Renee Dunn, Feliu, Miriam, McDougald, Camela, Johnson, Stephanie, Schmechel, Donald, Wood, Mary, Bennett, Gary G, Saurona, Patrick, Bonner, Melanie, Wellington, Chante’, DeCastro, Laura M, Whitworth, Elaine, Abrams, Mary, Logue, Patrick, Edwards, Lekisha, Martinez, Salutario, and Whitfield, Keith E

Subjects
Pediatrics, medicine.medical_specialty, neuroimaging, medicine.diagnostic_test, Adult patients, business.industry, Neuropsychology, Cognition, Review, Disease, Asymptomatic, neuropsychological assessment, Neuroimaging, Medicine, sickle cell disease, Neuropsychological assessment, medicine.symptom, business, Psychiatry, cerebral vascular event, Neurocognitive
Abstract

Traditionally, neuropsychological defi cits due to Sickle Cell Disease (SCD) have been understudied in adults. We have begun to suspect, however, that symptomatic and asymptomatic Cerebrovascular Events (CVE) may account for an alarming number of defi cits in this popula- tion. In the current brief review, we critically evaluated the pediatric and adult literatures on the neurocognitive effects of SCD. We highlighted the studies that have been published on this topic and posit that early detection of CVE via neurocognitive testing, neuropsychiatric evaluations, and neuroimaging may signifi cantly reduce adult cognitive and functional morbidities.

Published
2008

45. Differences in genetic and environmental variation in adult BMI by sex, age, time period, and region: an individual-based pooled analysis of 40 twin cohorts

Author

Silventoinen, Karri, primary, Jelenkovic, Aline, additional, Sund, Reijo, additional, Yokoyama, Yoshie, additional, Hur, Yoon-Mi, additional, Cozen, Wendy, additional, Hwang, Amie E, additional, Mack, Thomas M, additional, Honda, Chika, additional, Inui, Fujio, additional, Iwatani, Yoshinori, additional, Watanabe, Mikio, additional, Tomizawa, Rie, additional, Pietiläinen, Kirsi H, additional, Rissanen, Aila, additional, Siribaddana, Sisira H, additional, Hotopf, Matthew, additional, Sumathipala, Athula, additional, Rijsdijk, Fruhling, additional, Tan, Qihua, additional, Zhang, Dongfeng, additional, Pang, Zengchang, additional, Piirtola, Maarit, additional, Aaltonen, Sari, additional, Öncel, Sevgi Y, additional, Aliev, Fazil, additional, Rebato, Esther, additional, Hjelmborg, Jacob B, additional, Christensen, Kaare, additional, Skytthe, Axel, additional, Kyvik, Kirsten O, additional, Silberg, Judy L, additional, Eaves, Lindon J, additional, Cutler, Tessa L, additional, Ordoñana, Juan R, additional, Sánchez-Romera, Juan F, additional, Colodro-Conde, Lucia, additional, Song, Yun-Mi, additional, Yang, Sarah, additional, Lee, Kayoung, additional, Franz, Carol E, additional, Kremen, William S, additional, Lyons, Michael J, additional, Busjahn, Andreas, additional, Nelson, Tracy L, additional, Whitfield, Keith E, additional, Kandler, Christian, additional, Jang, Kerry L, additional, Gatz, Margaret, additional, Butler, David A, additional, Stazi, Maria A, additional, Fagnani, Corrado, additional, D’Ippolito, Cristina, additional, Duncan, Glen E, additional, Buchwald, Dedra, additional, Martin, Nicholas G, additional, Medland, Sarah E, additional, Montgomery, Grant W, additional, Jeong, Hoe-Uk, additional, Swan, Gary E, additional, Krasnow, Ruth, additional, Magnusson, Patrik KE, additional, Pedersen, Nancy L, additional, Dahl Aslan, Anna K, additional, McAdams, Tom A, additional, Eley, Thalia C, additional, Gregory, Alice M, additional, Tynelius, Per, additional, Baker, Laura A, additional, Tuvblad, Catherine, additional, Bayasgalan, Gombojav, additional, Narandalai, Danshiitsoodol, additional, Spector, Timothy D, additional, Mangino, Massimo, additional, Lachance, Genevieve, additional, Burt, S Alexandra, additional, Klump, Kelly L, additional, Harris, Jennifer R, additional, Brandt, Ingunn, additional, Nilsen, Thomas S, additional, Krueger, Robert F, additional, McGue, Matt, additional, Pahlen, Shandell, additional, Corley, Robin P, additional, Huibregtse, Brooke M, additional, Bartels, Meike, additional, van Beijsterveldt, Catharina EM, additional, Willemsen, Gonneke, additional, Goldberg, Jack H, additional, Rasmussen, Finn, additional, Tarnoki, Adam D, additional, Tarnoki, David L, additional, Derom, Catherine A, additional, Vlietinck, Robert F, additional, Loos, Ruth JF, additional, Hopper, John L, additional, Sung, Joohon, additional, Maes, Hermine H, additional, Turkheimer, Eric, additional, Boomsma, Dorret I, additional, Sørensen, Thorkild IA, additional, and Kaprio, Jaakko, additional

Published
2017
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46. Does the sex of one’s co-twin affect height and BMI in adulthood? A study of dizygotic adult twins from 31 cohorts

Author

Bogl, Leonie H., primary, Jelenkovic, Aline, additional, Vuoksimaa, Eero, additional, Ahrenfeldt, Linda, additional, Pietiläinen, Kirsi H., additional, Stazi, Maria A., additional, Fagnani, Corrado, additional, D’Ippolito, Cristina, additional, Hur, Yoon-Mi, additional, Jeong, Hoe-Uk, additional, Silberg, Judy L., additional, Eaves, Lindon J., additional, Maes, Hermine H., additional, Bayasgalan, Gombojav, additional, Narandalai, Danshiitsoodol, additional, Cutler, Tessa L., additional, Kandler, Christian, additional, Jang, Kerry L., additional, Christensen, Kaare, additional, Skytthe, Axel, additional, Kyvik, Kirsten O., additional, Cozen, Wendy, additional, Hwang, Amie E., additional, Mack, Thomas M., additional, Derom, Catherine A., additional, Vlietinck, Robert F., additional, Nelson, Tracy L., additional, Whitfield, Keith E., additional, Corley, Robin P., additional, Huibregtse, Brooke M., additional, McAdams, Tom A., additional, Eley, Thalia C., additional, Gregory, Alice M., additional, Krueger, Robert F., additional, McGue, Matt, additional, Pahlen, Shandell, additional, Willemsen, Gonneke, additional, Bartels, Meike, additional, van Beijsterveldt, Toos C. E. M., additional, Pang, Zengchang, additional, Tan, Qihua, additional, Zhang, Dongfeng, additional, Martin, Nicholas G., additional, Medland, Sarah E., additional, Montgomery, Grant W., additional, Hjelmborg, Jacob v. B., additional, Rebato, Esther, additional, Swan, Gary E., additional, Krasnow, Ruth, additional, Busjahn, Andreas, additional, Lichtenstein, Paul, additional, Öncel, Sevgi Y., additional, Aliev, Fazil, additional, Baker, Laura A., additional, Tuvblad, Catherine, additional, Siribaddana, Sisira H., additional, Hotopf, Matthew, additional, Sumathipala, Athula, additional, Rijsdijk, Fruhling, additional, Magnusson, Patrik K. E., additional, Pedersen, Nancy L., additional, Aslan, Anna K. Dahl, additional, Ordoñana, Juan R., additional, Sánchez-Romera, Juan F., additional, Colodro-Conde, Lucia, additional, Duncan, Glen E., additional, Buchwald, Dedra, additional, Tarnoki, Adam D., additional, Tarnoki, David L., additional, Yokoyama, Yoshie, additional, Hopper, John L., additional, Loos, Ruth J. F., additional, Boomsma, Dorret I., additional, Sørensen, Thorkild I. A., additional, Silventoinen, Karri, additional, and Kaprio, Jaakko, additional

Published
2017
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48. Genetic and environmental influences on adult human height across birth cohorts from 1886 to 1994

Author

Jelenkovic, Aline, primary, Hur, Yoon-Mi, additional, Sund, Reijo, additional, Yokoyama, Yoshie, additional, Siribaddana, Sisira H, additional, Hotopf, Matthew, additional, Sumathipala, Athula, additional, Rijsdijk, Fruhling, additional, Tan, Qihua, additional, Zhang, Dongfeng, additional, Pang, Zengchang, additional, Aaltonen, Sari, additional, Heikkilä, Kauko, additional, Öncel, Sevgi Y, additional, Aliev, Fazil, additional, Rebato, Esther, additional, Tarnoki, Adam D, additional, Tarnoki, David L, additional, Christensen, Kaare, additional, Skytthe, Axel, additional, Kyvik, Kirsten O, additional, Silberg, Judy L, additional, Eaves, Lindon J, additional, Maes, Hermine H, additional, Cutler, Tessa L, additional, Hopper, John L, additional, Ordoñana, Juan R, additional, Sánchez-Romera, Juan F, additional, Colodro-Conde, Lucia, additional, Cozen, Wendy, additional, Hwang, Amie E, additional, Mack, Thomas M, additional, Sung, Joohon, additional, Song, Yun-Mi, additional, Yang, Sarah, additional, Lee, Kayoung, additional, Franz, Carol E, additional, Kremen, William S, additional, Lyons, Michael J, additional, Busjahn, Andreas, additional, Nelson, Tracy L, additional, Whitfield, Keith E, additional, Kandler, Christian, additional, Jang, Kerry L, additional, Gatz, Margaret, additional, Butler, David A, additional, Stazi, Maria A, additional, Fagnani, Corrado, additional, D'Ippolito, Cristina, additional, Duncan, Glen E, additional, Buchwald, Dedra, additional, Derom, Catherine A, additional, Vlietinck, Robert F, additional, Loos, Ruth JF, additional, Martin, Nicholas G, additional, Medland, Sarah E, additional, Montgomery, Grant W, additional, Jeong, Hoe-Uk, additional, Swan, Gary E, additional, Krasnow, Ruth, additional, Magnusson, Patrik KE, additional, Pedersen, Nancy L, additional, Dahl-Aslan, Anna K, additional, McAdams, Tom A, additional, Eley, Thalia C, additional, Gregory, Alice M, additional, Tynelius, Per, additional, Baker, Laura A, additional, Tuvblad, Catherine, additional, Bayasgalan, Gombojav, additional, Narandalai, Danshiitsoodol, additional, Lichtenstein, Paul, additional, Spector, Timothy D, additional, Mangino, Massimo, additional, Lachance, Genevieve, additional, Bartels, Meike, additional, van Beijsterveldt, Toos CEM, additional, Willemsen, Gonneke, additional, Burt, S Alexandra, additional, Klump, Kelly L, additional, Harris, Jennifer R, additional, Brandt, Ingunn, additional, Nilsen, Thomas Sevenius, additional, Krueger, Robert F, additional, McGue, Matt, additional, Pahlen, Shandell, additional, Corley, Robin P, additional, Hjelmborg, Jacob v B, additional, Goldberg, Jack H, additional, Iwatani, Yoshinori, additional, Watanabe, Mikio, additional, Honda, Chika, additional, Inui, Fujio, additional, Rasmussen, Finn, additional, Huibregtse, Brooke M, additional, Boomsma, Dorret I, additional, Sørensen, Thorkild I A, additional, Kaprio, Jaakko, additional, and Silventoinen, Karri, additional

Published
2016
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50. A VALIDATION OF ESTIMATED TOTAL PERIPHERAL RESISTANCE USING TWIN DATA

Author

Hill, LaBarron K., Sollers, John J., Edwards, Christopher L., Thayer, Julian F., and Whitfield, Keith E.

Subjects
Article
Abstract

Chronically elevated total peripheral resistance (TPR) is a suspected contributor to the greater rates of hypertension in African Americans. Previous research suggests that over 50% of the variability in measures of vascular resistance may be attributable to genetic effects and genetic effects may play an even greater role in variability of TPR in African Americans. We have previously demonstrated the coherence of a simple equation-based estimate of total peripheral resistance (TPRest) with TPR obtained via a validated method (Hill et al, 2013). We sought further validation by estimating heritability for this measure. Using quantitative genetic analysis, heritabilites were calculated for TPRest during both a resting baseline and orthostasis in a population-based sample of African American mono- and dizygotic twins (mean age = 49.82 ± 14.62). Estimated heritability was greater for males (h2 = .40) both at rest and during orthostasis, compared to all other groups. This value is consistent with previously published point estimates of heritability. Collectively, these findings provide additional support for the validity of TPRest as a practical alternative for deriving additional hemodynamic data from archival sources.

Published
2014

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