Murder’s only the most extreme outcome. Physical harm happens at much higher rates than murder, and abuse might well affect this study.
Rates of violence between partners show men instigating and abusing more often. A couple of different UN and US sources here are showing that a little over one in five women experiences abuse during her lifetime, compared to a bit under one in ten men: https://en.m.wikipedia.org/wiki/Domestic_violence_in_the_Uni...