years (mean 6.2, SD ± .34). Assessments were carried out in the fall of grade 1, with annual follow-up assessments in the spring of grades 6 through 12. Genetic samples were collected shortly after high school. Written informed consent was obtained from each participant and the Institutional Review Board approved the study. For additional information on the design of the trial, see Bradshaw and colleagues (2009); Ialongo and colleagues (1999); or Ialongo and colleagues (2001).
