Prevalence of postdeployment mental disorders by predeployment (T0) attention deficit and hyperactivity disorder (ADHD) status. Postdeployment disorders were considered present if diagnostic criteria were met at 3 or 9 months postdeployment (T2 or T3). Between-groups differences were significant for all outcomes, χ2(1, N = 4612) = 58.5–255.22, ps < .001. However, these comparisons and the estimates shown in the figure are unadjusted whereas the predictive models of the effects of predeployment ADHD on postdeployment posttraumatic stress disorder (PTSD), major depressive episode (MDE), generalized anxiety disorder (GAD), and suicidal ideation (SI) control for a wide range of factors. Predeployment ADHD was not significantly associated with postdeployment SI after imposing these controls but did display independent associations with the other outcomes.