The results from the saturated homogeneity model of composite maltreatment indicated that genetically-mediated child effects were small (6%). The shared- and twin-environmental influences combined to account for approximately 30% of the variance in maltreatment. The homogeneity and heterogeneity models of physical maltreatment exhibited similar ratios of fit to parsimony as measured by AIC despite yielding substantially different parameter estimates. Whereas results from the homogeneity model indicated modest to moderate genetically-mediated child effects and small shared- and twin- environmental effects, the results from the heterogeneity model suggested small genetically-mediated child effects and shared- and twin-environmental effects that were moderate for males and large for females. Models examining neglect suggest that about one quarter of the variance was due to genetically driven child effects. Shared- and twin-specific environmental influences combined to account for approximately 13% of the variance. The results from the heterogeneity model suggest that the magnitude of genetic influences is greater in females than in males. Most of the variance in sexual maltreatment was due to nonshared environmental influences. In contrast to physical maltreatment or neglect, there was no evidence
