What proportion of adults in the United States experience posttraumatic stress disorder in their lifetime, and how does it divide between women and men?

1. Roughly 7% of United States adults experience posttraumatic stress disorder at some point in life. 2. Within that total, 9.7% of women and 3.6% of men are affected, so the rate is higher among women. 3. Rates run higher still in groups exposed to mass trauma or to duty-related trauma, such as police officers and firefighters. 4. The figure near 21% describes residents of areas hit by Hurricane Katrina one year afterwards, not the national rate. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 15 "Psychological Disorders", section 15.6 Posttraumatic Stress Disorder_