Psychological burden of PTSD, depression, and their comorbidity in the US veteran population: Suicidality, functioning, and service utilization

Background: Emerging evidence suggests that comorbid posttraumatic stress disorder (PTSD) and major depressive disorder (PTSD/MDD) may impose an even greater burden than either disorder alone. However, nearly all previous studies examining these associations have relied on treatment-seeking samples. This study examined the mental health burden associated with co-occurring PTSD/MDD compared to PTSD and MDD alone using a nationally representative sample of U.S. veterans. Methods: Data were analyzed from National Health and Resilience in Veterans Study, a nationally representative survey of U.S. veterans (n = 2,732). Analyses (a) estimated the current prevalence of PTSD only, MDD only, and comorbid PTSD/MDD; (b) compared demographic/military variables by PTSD/MDD status; and (c) examined associations between PTSD/MDD status and suicidality, functioning, psychiatric comorbidities, and service utilization. Results: The current prevalences of probable PTSD only, probable MDD only, and probable comorbid PTSD/MDD were 1.7%, 4.8%, and 3.4%. Compared to all other groups, the PTSD/MDD group was more likely to screen positive for current suicidal ideation, lifetime suicide attempts, probable generalized anxiety and social anxiety disorders, and ever utilize mental health services. They also scored lower on measures of mental health functioning (d = 1.49), cognitive functioning (d = 1.03), and quality of life (d = 0.84). Veterans with comorbid PTSD/MDD were more than twice as likely as those with PTSD only to have attempted suicide. Limitations: The cross-sectional design of this study precludes causal inference. Conclusions: Results provide a population-based characterization of the psychological burden of PTSD/MDD comorbidity in U.S. veterans. Findings further underscore the importance of screening, monitoring, and treatment of the comorbid manifestation of these disorders.