One in three women suffers violence, WHO global study finds

[bunnies]

28. A percentage is not easy to come by...

but I did find this:

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Due to cultural norms that require men to present a strong façade and that minimize female-perpetrated abuse (Mooney, 2000; Straus et al, 1997; Sorenson & Taylor, 2005), men are less likely to verbalize fear of any kind.
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Surveys find that men and women assault one another and strike the first blow at approximately equal rates.
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Men and women engage in overall comparable levels of abuse and control, such as diminishing the partner’s self-esteem, isolation and jealousy, using children and economic abuse; however, men engage in higher levels of sexual coercion and can more easily intimidate physically.

Halfway down the page: http://dvrc-or.org/domestic/violence/resources/C61/