From the abstract

In nonreciprocally violent relationships, women were the perpetrators in more than 70% of the cases

From inside the paper .

For perpetrators who were women, IPV was more frequent when perpetrated in the context of reciprocal IPV versus nonreciprocal IPV (AOR=2.23; P<.001). In other words, women perpetrated IPV more frequently in the context of reciprocal violence than in nonreciprocal violence.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1854883/