There was no main effect (χ2Δ = 2.69, 1 df, p = 0.10) or moderating effect of percentage of older adolescents (moderation of ACE dropped: χ2Δ = 1.74, 3 df, p = 0.63) on alcohol use frequency among males. Among females, dropping the main effect caused a significant decrease in goodness of fit (χ2Δ = 6.89, 1 df, p = 0.01). There was also a marginally significant moderation effect (moderation of ACE dropped: χ2Δ = 7.85, 3 df, p = 0.05). Dropping the moderation of the individual variance components indicated that this effect was due to moderation of the E component (moderation of A dropped: χ2Δ = 0.60, 1 df, p = 0.44; moderation of C dropped: χ2Δ = 0.86, 1 df, p = 0.35; moderation of E dropped: χ2Δ = 5.88, 1 df, p = 0.02). As the percentage of residents age 15 to 19 increased, the degree of unique environmental influence decreased, from 23% to 3% across the distribution of older individuals.
