Considering millions of years of evolution shaped female brains to be the primary caregivers, isn't this a common sense approach and explanation for the behavior?
I don't know, I tried my hardest to keep my post non-normative - it's basically a factual one paragraph summary of every goverment report on this of the last 15 years. In the context of the overall thread, the underlying point is that 'nr of hours worked' is only one data point, and is only meaningful when interpreted for a well defined purpose and when considered with many other factors.
