Results of the analysis of the effects of parental alcohol use and misuse are given in Table 4; comparable results for the effects of elder sibling alcohol use and misuse and peer deviance are given in Supplementary tables S1 and S2, respectively. The means of potential environmental influences did not differ between ALDH2 genotype groups (parent combined alcohol problem index: t(898) = .06, p = .96; elder sibling combined alcohol problem index t(363) = −.7, p = .48; peer deviance t(826) = .98, p = .33), indicating absence of gene-environment correlation. Birth order status (ie; being either a younger or elder sibling) also did not vary between ALDH2 genotype groups, X2(1) = 0.04, p = 0.84.
