I think it's hardly a problem just for men, it's probably just the statistic they have been able to easily measure or have data for. And especially given that w

I think it's hardly a problem just for men, it's probably just the statistic they have been able to easily measure or have data for. And especially given that women have an increasing role over time in the work force, that would confound the numbers a bit if you are trying to measure things more stably over the last few decades.