In contrast, twins who experienced maltreatment were not at higher risk for AAD compared with their co-twins without maltreatment. Furthermore, risk for AAD was not significantly different for discordant MZ pairs (OR 0.92, 95% CI 0.40–2.01) and DZ pairs (OR 0.94, 95% CI 0.47–1.89). These results are consistent with there being common environmental influences that contribute to both childhood maltreatment and AAD.
