traumatic events and asked the participant to list up to three events. In order to use available trauma exposure data from both the SSAGA-IV and SSAGA-II, we examined a binary measure of trauma exposure (0: not exposed, 1: exposed), based on SSAGA-II and SSAGA-IV responses, to maximize statistical power, which is especially crucial in GxE studies. All individuals who were not interviewed using the SSAGA-II or SSAGA-IV and hence were not asked about trauma exposure were coded as “unknown” and excluded from PRS × trauma analyses. As compared to those with available trauma data (N: 6613), those with missing data related to trauma exposure (“unknown”, N: 4341) were more likely to be older and “White/Caucasian.”
