One in eight rescue and recovery workers (12.4%) had probable post-traumatic stress disorder when they were interviewed in 2003 and 2004. The prevalence of post-traumatic stress disorder (PTSD) varied significantly by occupation, with rates ranging from 6.2% among police officers to 21.2% among unaffiliated volunteers (those who were not working with an organization such as the Red Cross). The prevalence of PTSD in the U.S. population is roughly 4% at any given time.
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