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Electroencephalography (EEG) represents a widely established method for assessing altered and typically developing brain function. However, systematic studies on EEG data quality, its correlates, and consequences are scarce. To address this research gap, the current study focused on the percentage of artifact-free segments after standard EEG pre-processing as a data quality index. We analyzed participant-related and methodological influences, and validity by replicating landmark EEG effects. Further, effects of data quality on spectral power analyses beyond participant-related characteristics were explored. EEG data from a multicenter ADHD-cohort (age range 6 to 45 years), and a non-ADHD school-age control group were analyzed (n total = 305). Resting-state data during eyes open, and eyes closed conditions, and task-related data during a cued Continuous Performance Task (CPT) were collected. After pre-processing, general linear models, and stepwise regression models were fitted to the data. We found that EEG data quality was strongly related to demographic characteristics, but not to methodological factors. We were able to replicate maturational, task, and ADHD effects reported in the EEG literature, establishing a link with EEG-landmark effects. Furthermore, we showed that poor data quality significantly increases spectral power beyond effects of maturation and symptom severity. Taken together, the current results indicate that with a careful design and systematic quality control, informative large-scale multicenter trials characterizing neurophysiological mechanisms in neurodevelopmental disorders across the lifespan are feasible. Nevertheless, results are restricted to the limitations reported. Future work will clarify predictive value.

There is growing evidence of an association between ADHD and rule-breaking behaviour and that subjects with ADHD are more likely to be involved in the legal system. However, the research on ADHD as a risk factor not only for delinquency but also for recidivism is scarce and findings are controversial. Therefore, we explored the impact of ADHD on the course of delinquency in a sample of incarcerated young men. We conducted a 15-year follow-up study by investigating the criminal records of 106 former youth prisoners. Criminal recidivism was operationalized through three variables: criminal recidivism; frequency of recidivism; and time to recidivism. The incremental predictive validity of ADHD was analysed using survival analysis and controlled for confounders associated with recidivism. Offenders with ADHD (n = 74) reoffended 2.5 times faster and showed a higher rate of recidivism and further incarcerations compared to non-ADHD offenders (n = 33), even when controlling for general risk factors such as antisocial personality disorder. Median survival rate ranged between 6 and 7 months in the ADHD groups and 25 months in the non-ADHD group. Our results revealed that ADHD has an incremental predictive power on criminal recidivism, even above general risk factors. Moreover, the criminogenic influence of ADHD appeared to be crucial in terms of the interplay of childhood ADHD, irrespectively of the persistence of the symptomatology into later life. Our findings therefore highlight the importance of early intervention and consequently prevention.

Background: Over the last decade, a wide range of attention-deficit/hyperactivity disorder (ADHD) treatment approaches for adults, including both pharmacological interventions and psychosocial treatments, have been proposed and observed to be efficient. In practice, individual treatment concepts are based on results of clinical studies as well as international guidelines (NICE Guidelines) that recommend a step-by-step treatment approach. Since the evidence supporting this approach is limited, the aim of the present study is to determine an optimal intervention regarding severity levels of ADHD symptomatology conducting a randomized controlled trial., Method: We aim to include 279 ADHD subjects aged between 16 and 45 years. First, participants are randomized to either a face-to-face psychoeducation, telephone assisted self-help (TASH), or a waiting control group (Step 1). All participants assigned to the control group are treated using TASH after a 3-month waiting period. Participants are then allocated to one of three groups, based on their remaining severity level of ADHD symptoms, as (1) full responder, (2) partial responder, or (3) non-responder (Step 2). Full responders receive counseling, partial responders receive either counseling only or counseling and neurofeedback (NF), and non-responders receive either pharmacological treatment only or pharmacological treatment and NF, followed by a 3 month period without intervention., Discussion: The naturalistic sample is one of the study's advantages, avoiding highly selective inclusion or exclusion criteria. The efficacy of an evidence-based stepped care intervention is explored by primary (reduction of severity of ADHD symptoms) and secondary outcomes (functional outcomes, e.g., quality of life, anger management, enhancement of psychosocial well-being). Predictors of therapeutic response and non-response are being investigated at each step of intervention. Further, sex differences are also being explored., Trial Registration: This study is registered by the German Trial Register (reference number: DRKS00008975 ), 23 October 2015.

Objective and Methods The aim of the study was to explore the psychometric properties of the ADHD self-rating ADHD-SR and the observer-rating Wender-Reimherr-Interview WRI for the assessment of ADHD symptoms in old age by using a sample of 324 subjects between 60 and 99 years. Results In the sample of older people the psychometric properties of the ADHD-SR and the WRI were adequate. Evidence for construct validity is provided through the WRI. Results of logistic analysis's showed a good discrimination of ADHD for both, the ADHD-SR (89.5 % correct classification; OR = 25.91) and the WRI (86.1 % correct classification; OR = 4.7); specificity ranged between 81 % and 94 %. Conclusion The study shows that both, the ADHD-SR and the WRI, are reliable and valid as tools for the assessment of ADHD in older adults., Competing Interests: Interessenkonflikt: Wolfgang Retz, Michael Rösler und Petra Retz-Junginger sind Autoren des HASE-Handbuchs, in welchem der ADHS-SB und WRI im deutschsprachigen Raum vertrieben wird, und stehen dadurch in wirtschaftlicher Verbindung zu Hogrefe.Der korrespondierende Autor versichert jedoch, dass die Studie produktneutral durchgeführt wurde., (© Georg Thieme Verlag KG Stuttgart · New York.)

Objectives: In consideration of ADHD subtype we assessed burden of disease of adult ADHD patients and neuroticism., Methods: 511 adult ADHD patients were enrolled in the study. We measured ADHD symptoms categorically and dimensionally by the "Homburger ADHS-Skalen für Erwachsene (HASE)". All participants rated their ADHD associated level of suffering. To assess personality traits, the psychometric instrument NEO-PI-R was used., Results: In patients with higher levels of neuroticism, there was no significant difference in the level of suffering between the ADHD subtypes. In the group of ADHD patients which scored low on the neuroticism scale, ADHD combined patients are significant more affected compared to the predominantly hyperactive-impulsive or the predominantly inattentive type., Conclusions: These results underline the hypothesis that the burden of disease is not only related to the level of ADHD symptoms and subtype but also moderated by neuroticism., (© Georg Thieme Verlag KG Stuttgart · New York.)