Linear regression models testing the effects of PER2 rs56013859 genotype, severe negative life events and their interaction on drinking measures in young adult regular drinkers (n = 131).

Note: All models adjusted for sex and age. Main effects of genotype and severe negative life events were entered in a first step, followed by the interaction term in a second step.1Unstandardized regression coefficients from linear regression (standard errors);2referring to the last 45 days.