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Prospective post traumatic stress disorder symptom trajectories in active duty and separated military personnel
NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA SAN DIEGO United States
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Post-traumatic stress disorder PTSD is a serious mental illness that affects current and former military service members at a disproportionately higher rate than the civilian population. Prior studies have shown that PTSD symptoms follow multiple trajectories in civilians and military personnel. The current study examines whether the trajectories of PTSD symptoms of veterans separated from the military are similar to continuously serving military personnel. The Millennium Cohort Study is a population-based study of military service members that commenced in 2001 with follow-up assessments occurring approximately every 3 years thereafter. PTSD symptoms were assessed at each time point using the PTSD Checklist. Latent growth mixture modeling was used to compare PTSD symptom trajectories between personnel who separated veterans n 5292 and personnel who remained in military service active duty n 16,788. Four distinct classes resilient, delayed-onset, improving, and elevated-recovering described PTSD symptoms trajectories in both veterans and active duty personnel. Trajectory shapes were qualitatively similar between active duty and veterans. However, within the resilient, improving, and elevated recovering classes, the shapes were statistically different. Although the low-symptom class was the most common in both groups veterans 82 active duty 87 , veterans were more likely to be classified in the other three classes in all cases, p 0.01. The shape of each trajectory was highly similar between the two groups despite differences in military and civilian life.
APPROVED FOR PUBLIC RELEASE