"The most recent large-scale study of domestic violence was conducted by Harvard researchers and published in the American Journal of Public Health. The study, which surveyed 11,000 men and women, found that, according to both men's and women's accounts, 50 percent of the violence in their relationships was reciprocal (involving both parties). In those cases, the women were more likely to have been the first to strike. Moreover, when the violence was one-sided, both women and men said women were the perpetrators about 70 percent of the time. "
http://www.washingtontimes.com/news/2009/jul/14/a-domestic-violence-victim/