Table 4 shows the fit of the homogeneity and heterogeneity univariate models for composite maltreatment, physical maltreatment, and neglect. For each variable, the homogeneity model exhibited the best combination of fit and parsimony, as exhibited by Akaike’s Information Criterion (AIC), though the difference was small for physical maltreatment. The magnitude of genetic and environmental influences can be constrained to be equal for males and females without a statistically significant decrease in fit. However, this may be due in part to low statistical power. Therefore, parameter estimates from both homogeneity and heterogeneity models were examined.
