The descriptive statistics and correlations across all phenotypes for adolescents and young adults are available in Tables S1 and S2 in the Supplemental Material available online. The phenotypes were moderately to highly correlated across both age groups, although conscientiousness did not relate to the substance use and antisocial behavior variables in young adults. Low parental monitoring and high peer substance use were associated with higher externalizing disorder composite scores (rs = -0.38 and 0.56, ps < 0.01).