The prevalence of lifetime AD was 13.4% among lifetime alcohol users (n = 1,141); individuals with AD showed higher mean number of traumatic events and PTSD symptoms (Table 1). Within the lifetime alcohol use sample (n=1,141), 968 (84.8%) reported any trauma exposure; among those TE individuals, mean PTSD symptoms was 2.80 (sd=3.40). After controlling for demographic variables, each additional traumatic event experienced increased odds of AD by 1.3, and each additional PTSD symptom increased odds of AD by 1.2 (Table 3). When PTSD symptoms were included in the regression analyses, estimates of the difference in the TE effect (τ-τ′) were significantly greater than 0 (Table 4), showing that PTSD accounted for at least part of the relationship between TE and AD. Specifically, 46.1% of the effect of TE load on AD was accounted for by PTSD symptoms (Table 4). However, trauma load increased risk for AD even after PTSD was accounted for (OR = 1.14, 95% CI=1.04–1.24; based on regression coefficient τ′ in Table 4), suggesting that TE also plays a role in AD that is independent of PTSD. Results
