The US government and feminists claim that 85% of DV victims are women, while many other studies have found closer to 50/50. Does anybody have some information to explain this difference?

For example, here is a BJS report stating that 85% of DV victims are women, and this figure is often cited by feminists as a reason to ignore male victims. On the other hand, there is this study finding that

The most comprehensive review of the scholarly domestic violence research literature ever conducted concludes, among other things, that women perpetrate physical and emotional abuse, and engage in control behaviors, at comparable rates to men.

And another list of sources here:

This bibliography examines 286 scholarly investigations: 221 empirical studies and 65 reviews and/or analyses, which demonstrate that women are as physically aggressive, or more aggressive, than men in their relationships with their spouses or male partners.

So what's the difference, how were the studies conducted? I know that when the government and feminists claim that 90% of rape victims are women, they are only counting male victims that were sodomized. Is something similar happening here? Are the studies finding a more even split biased in some way?

Also just a note, I really am looking for a critical analysis here, so try to be as objective as possible and keep the circle-jerking to a minimum, thanks.

EDIT: One thing I remember hearing about but don't know what the source is, is that the studies finding a larger proportion of female victims used subjective factors such as "were you afraid of your partner," which would obviously skew the results since we teach men never to admit fear while telling women to always be afraid of men. Again though I'm not sure where I heard that so if anybody has insight on that it would be helpful.