in one path and one covariance. Having more heavy drinking friends at age 29 predicted greater alcohol use at age 33 for those with the high risk DRD4 genotype (β=.21, p<.0l) but not those with the low risk genotype (β=.06, ns) [Δχ2(l)=9.44, p=.002]. This difference is depicted visually in Figure 2. Additionally, friends' alcohol use at age 33 was correlated with own concurrent alcohol use only among those with the high risk DRD4 genotype but not those with the low risk variants (r=.38, p<.001, vs. r=.07, ns) [Δχ2(l)=10.28, p=.001].
