Parents, teachers, and children completed assessments following initial recruitment (Wave 1, ages 3 to 5) with assessments occurring every 3 years (e.g., Wave 2, ages 6 to 8). To assess early developmentally relevant phenotypes, the current study focused on childhood (Wave 3, ages 9 to 11) to late adolescence (Wave 5, ages 15 to 17). Reports from multiple sources were included to minimize shared method variance. This study focuses on the subset of families that provided blood or saliva for genotyping (61.6%). Adolescents without genetic data did not differ from those who were included on any study variables. Informed consent and assent were obtained from the parents and children after study procedures were reviewed. The Institutional Review Board at the University of Michigan approved the study.
