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Understanding Research on the Epidemiology of Trauma and PTSD

A resource from the National Center for PTSD (Post Traumatic Stress Disorder) 

Epidemiology is the science concerned with the prevalence and distribution of health and illness in the population. Research on the epidemiology of PTSD has focused on three interrelated concepts: prevalence of exposure to potentially traumatic events, total prevalence of PTSD in the population, and conditional risk, which is the prevalence of PTSD given exposure.