“…The Dunedin Study ADHD phenotype measures have good psychometric reliability, and their construct validity is demonstrated by the Study's prior contributions to the ADHD literature. [59][60][61][62][63][64] Across multiple assessment ages (7,9,11,13,15,18, and 26 years) and across different methods of measurement and ascertainment (parentreports, teacher-reports, psychiatric interviews, personality self-reports, and personality informantreports), we failed to find a clear-cut and consistent association between DRD4 and hyperactivity. Our findings appear to contradict the results of a recent meta-analysis by Faraone et al 31 Interestingly, the meta-analysis found much stronger evidence for the association of DRD4 with ADHD in case-control studies than in family-based studies.…”