"Forty-four percent of women under correctional authority [including 57% of the women in State prisons], reported that they were physically or sexually assaulted at some time during their lives. Sixty-nine percent of women reporting an assault said that it had occurred before age 18."

Source

Greenfield, Lawrence A., and Snell, Tracy L., Bureau of Justice Statistics, Women Offenders (Washington, DC: US Department of Justice, December 1999), p. 8, Table 20.
http://www.bjs.gov/content/pu…