the intervention condition. The divergence can be accounted for by lower alcohol use among adolescents who affiliate with low substance-using friends within the control condition compared to the intervention. Thus, it seems that for a subset of youth—those with high OXTR risk but who associate with low-risk friends—the intervention is associated with higher alcohol use than comparable youth in the control group. It should be noted that this effect is relatively small and occurs among youth who report the lowest levels of drinking: those who affiliate with low substance-using friends.
