First, we determined whether youth DRD4 status interacted with condition to produce differential change in parenting behavior as a function of intervention. Using the analytic framework outlined previously, we found a main effect of participation in SAAF (γSAAF = .89, p < 0.01), but no significant effect for youth genotype for either DRD4 (γ g = 0.08, ns) or 5HTT (γ g = 0.14, ns), and no interaction of intervention with youth genotype at DRD4 (γS×G = -0.38, ns). A significant interaction of youth genotype at 5HTT with SAAF (γS×G = 1.65, p < .05) emerged. The results are summarized in Table 2. As can be seen, SAAF produced expected gains in intervention-targeted parenting behavior for all participants regardless of youth genotype at DRD4.
