Table 2.

Predictors of Alcohol Use Initiation

Predictors	Hazard Ratio	95% CI	p
Model 1: Main effects only
FH+ vs. FH−	1.36	[1.01,1.84]	.045
Sex (Male vs. Female)	0.94	[0.73,1.20]	.603
Age at baseline, year	1.14	[0.99,1.31]	.076
Mother-youth relationship quality	0.91	[0.41,2.00]	.811
Father-youth relationship quality	0.57	[0.31,1.06]	.077
Peer risky behavior	34.26	[8.64,135.81]	<.001
Neighborhood safety	0.89	[0.48,1.68]	.733
SES	1.18	[0.61,2.26]	.627
Behavioral phenotypes	1.04	[0.48,2.28]	.924
Model 2: Final model with three interaction terms
Peer risky behavior	38.61	[10.47,142.35]	<.001
Among FH -
Age at baseline	1.05	[0.84,1.33]	.641
Father-youth relationship quality	0.53	[0.13,2.16]	.375
Behavioral phenotypes	4.29	[0.58,31.91]	.155
Among FH +
Age at baseline	1.16	[0.98,1.36]	.083
Father-youth relationship quality	0.57	[0.30,1.09]	.089
Behavioral phenotypes	0.90	[0.40,2.02]	.805