Descriptive statistics and zero-order correlations for the study variables are presented in Table 2. Among EAs, positive correlations were observed between EXT PGS and externalizing behavior and peer substance use at both T1 and T2, and negative correlations were observed between EXT PGS and parental knowledge at both time points. T1 parental knowledge and T1 peer substance use were also correlated with T2 externalizing behavior. Among AAs, EXT PGS was not significantly correlated with any of the study variables. However, the pattern of correlations among the phenotypic variables were consistent with the correlations observed among EAs.
