Identifying transdiagnostic traumatic stress reactions in U.S. military veterans: A nationally representative study.

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Traumatic stress reactions (TSRs) exist on a continuum that includes posttraumatic stress disorder (PTSD), highly comorbid psychopathology, and resilience, highlighting the need for comprehensive and integrative approaches capable of capturing the full spectrum of heterogeneous reactions. Here, we used a transdiagnostic and multidimensional method to characterize clinical phenotypes of TSRs in a nationally representative sample of U.S. military veterans. The Middle-Out Approach was used to evaluate self-reported PTSD, generalized anxiety, major depressive symptoms, and physical and mental functioning to identify discrete latent classes of TSRs and their demographic, military and trauma history, and psychosocial correlates. Cross-sectional data were analyzed from 3,727 U.S. veterans who participated in the National Health and Resilience in Veterans Study. Latent class analysis identified five classes of veterans: low TSR (61.3%), anxious/depressive (16.6%), avoidant arousal (9.2%), dysphoric arousal (8.2%), and high TSR (4.7%). Veterans in the dysphoric arousal and high TSR classes demonstrated lower functioning than other classes, which showed similar levels of moderate-to-high functioning despite symptom differences. Classes distinguished between resilience to PTSD symptoms versus resilience to all symptoms and functioning domains and were differentially associated with demographic characteristics, trauma and military histories, and psychosocial characteristics. The results suggest that veterans exhibit different clinical phenotypes of TSRs, which may help inform etiology, diagnostic subtypes, and personalized treatment. Further, although most veterans with psychopathology experience functional impairment, a sizable subset demonstrates high functioning despite psychopathology symptoms.