 Major depressive disorder, 48% of men and 49% of women, and lifetime alcohol abuse or dependence, 51.9% of men and 27.9% of women, are the most common comorbid disorders.The United States Department of Veterans Affairs estimates that 830,000 Vietnam War veterans suffered symptoms of PTSD.The "National Vietnam Veterans' Readjustment Study" (NVVRS) found 15% of male and 9% of female Vietnam veterans had PTSD at the time of the study.