What percentage of rape victims develop Post Traumatic Stress Disorder (PTSD) after being raped?

Posttraumatic Stress Disorder (PTSD) involves a pattern of symptoms that some individuals develop after experiencing a traumatic event such as sexual assault. Treatment of the victim after the rape directly affects the degree of PTSD the victim will suffer. Symptoms of PTSD include repeated thoughts of the assault; memories and nightmares; avoidance of thoughts, feelings, and situations related to the assault; and increased arousal (e.g., difficulty sleeping and concentrating, jumpiness, irritability). One study that examined PTSD symptoms among women who were raped found that 94% of women experienced these symptoms during the two weeks immediately following the rape. Nine months later, about 30% of the women were still reporting this pattern of symptoms. The National Women's Study reported that almost 1/3 of all rape victims develop PTSD sometime during their lives and 11% of rape victims currently suffer from the disorder.

Resource: Sue Orsillo, Ph.D.; Sexual Assault against Females