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Brewin, C., Andrews, B., & Valentine, J. (2000). Meta-analysis of risk factors for Posttraumatic Stress Disorder in trauma-exposed adults. Journal of Consulting and Clinical Psychology, 68(5), 748-766.

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The study conducted a meta-analysis of 14 risk factors for posttraumatic stress disorder. In some groups, factors such as gender and age of trauma predicted PTSD. Childhood adversity was a very good predictor of PTSD. Stress also was a big risk factor because it was associated with a greater amount of PTSD.