The effect of pre-existing alcohol use disorder on the risk of developing posttraumatic stress disorder: results from a longitudinal national representative sample.

Background: There is inconsistent evidence in the literature as to whether or not Alcohol Use Disorder (AUD) is a risk factor for Post-Traumatic Stress Disorder (PTSD).Objectives: We evaluated the risk of developing PTSD after trauma exposure in individuals with AUD. As a secondary analysis, we also tested if alcohol dependence or alcohol abuse separately increased the risk of PTSD development. We also explored the effect of AUD on exposure to various traumas.Methods: Longitudinal data was obtained from 30,180 individuals with and without AUD from National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) waves I and II. Using propensity score methods, we matched individuals with AUD (alcohol abuse and/or dependence using DSM-IV criteria) to those without AUD at baseline on demographic, familial, and clinical factors to estimate the risk of PTSD development after trauma exposure. Data were adjusted for complex survey methods.Results: Individuals with AUD had an increased risk of being exposed to various traumas between wave I and II (60.6% vs. 48.3% of controls). Among individuals exposed to trauma between the two waves (N = 14,107), AUD had no effect on subsequent PTSD development after matching and controlling for covariates (OR: 1.00; 95%CI: 0.72-1.39; p = .99). However, those with alcohol dependence only did have an effect on subsequent PTSD development (OR: 1.76; 95%CI: 1.05-2.95; p = .03).Conclusion: In individuals with alcohol dependence the experience of trauma increases the risk of developing PTSD. These findings suggest that prevention methods from PTSD after trauma exposure for individuals with alcohol dependence are needed.