This is madness. Breasts and uteri are relevant to this discussion. They set a lower bound on how much time a woman can take off when a couple has children. The lower bound for men is zero. My claim is that all other things being equal, this higher lower bound makes it likely that women take more time off of work. This is not guaranteed, but it's a fairly reasonable, uncontroversial conclusion. There's nothing wrong with clearly labeled conjecture, and I welcome hard evidence either way.

"Women work fewer hours than men - A specific claim about women that may be used by some to justify their prejudices against women."

From my original comment: "Fortunately, there are far better indicators than gender of how prone an individual is to take extended leave." Choosing a man over a woman based on gender alone isn't just bad for society; it's poor reasoning.