Model III (Table 3) was fit with no overlap by fixing the overlapping genetic, individual-specific, and common environmental influences at zero. This fit significantly worse than the reduced model (Δχ2=52.3, df=3, p<0.01), indicating good power to reject the hypothesis of no childhood maltreatment–AAD association. To test whether the overlapping risk for childhood maltreatment and AAD is due to environmental influences only, model IV (Table 3) was fit by fixing the overlapping genetic influences at zero. This model did not fit significantly worse than model II (Δχ2=0.0, df=1, p=0.99).
