Table 2. 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).

Drinking measures1	rs56013859 genotype		Severe negative life events		rs56013859 × severe negative life events
	B	p	B	p	B	p
Number of drinking days2	−2.929 (1.450)	.046	0.276 (0.205)	.181	0.110 (0.628)	.861
Total number of drinks2	−9.871 (10.215)	.336	6.506 (1.443)	<.001	−2.704 (4.416)	.541
AUDIT score	−0.437 (0.795)	.584	0.572 (0.112)	<.001	−0.786 (0.337)	.021

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.