Descriptive statistics and correlations between variables are presented in Table 1. Alc-GPS was positively correlated with sensation seeking (r = .07) and alcohol use (r = .10), negatively correlated with family support (r = −.05), but was not significantly correlated with friend support (r = −.03). Sensation seeking was negatively correlated with family and friend support (r = −.13 and r = −.05, respectively) and positively correlated with alcohol use (r = .19). Family and friend support were modestly correlated (r = .44) and both were negatively correlated with alcohol use (r = −.14 and r = −.18, respectively). Age and sex both showed significant correlations with sensation seeking, social support, and alcohol use, suggesting the importance of including them as covariates in analyses and exploring potential differences in pathways of risk across age and sex. PC1-PC3 were all correlated with alc-GPS; PC1 was also correlated with alcohol use, suggesting the importance of accounting for potential confounding effects due to population stratification even in our sample with all participants of European ancestry.
