This strategy resulted in an analytic sample of 1,111 adolescents (50% female) from a total of 739 nuclear families (from 443 COGA extended families). Specifically, this sample included 719 European (EA; Mage = 12.97, SD = 1.13 at baseline assessment; 50% female) and 392 African (AA; Mage = 13.01, SD = 1.12 at baseline assessment; 50% female) ancestry participants. Among the EA sample, parental genomic data were available for 664 (92%) of the mothers and 466 (65%) of the fathers. Among the AA analytic sample, parental genomic data were available for 355 (91%) of the mothers and 176 (45%) of the fathers.
