The nonshared environmental correlations between AUD and divorce for males (rE = +0.32) and females (rE = +0.27) further suggest that there are factors that differ between twins and siblings that predispose to AUD and divorce. Partners may be a meaningful nonshared environment (29) that contributes to the propensity to develop AUD or become divorced. Romantic partners influence one another’s alcohol use (26), and discordance in partners’ heavy drinking habits predicts divorce (27). Furthermore, the significant nonshared environmental correlation is also consistent with prior evidence of bidirectional causal relationships between AUD and divorce (38, 39).
