PS: Using police reports skewers the results... too many men do not  go to the police to report  being attacked  , partly because they are often too humiliated by the experience and fear   being ridiculed by the police for not being "man enough" to take it.  Better and different results are gleaned by surveying hospital records, where male patients are more ready to open up and admit that their   injuries were caused by their wives beating them up. It has been from using hospital records that sociologists realized that there is parity between the sexes when it comes to Domestic Violence