Following the same series of tests used for the other moderators, we first tested moderation on the cross paths using the bivariate moderation model. As shown in Table 5, moderation was retained on the cross c path indicating it is inappropriate to use the extended univariate model to further test for moderation. Therefore, moderation was further tested on the unique a, c and e paths using the bivariate model. Table 5 shows moderation could be dropped on the unique a path but not the unique c and e paths. Figure 3 shows the changes in raw variance of the shared and unique A, C and E as a function of stressful life events. The shared and unique environmental influences (but not additive genetic influences) were greatest under conditions of greater potentially stressful life events and diminished at lower numbers of potentially stressful life events. The additive genetic influences did not change significantly as a function of the number of potentially stressful life events.
