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There's a datum missing here. Leaving it out creates a misleading perspective.
When one person hits and the other doesn't hit back, it's 71% likely to be the woman who hits.
That doesn't equal 71% of violence is instigated by women. It just means that more men than women are likely not to hit back. We need to know what percentage of violence is non-reciprocal before this statistic becomes meaningful in terms of overall violence.