The trouble with almost any of these studies of gender differences is that you get hugely overlapping populations. What that means, to take a very simple example, is that while men tend to be taller than women, you'll find large numbers of both in the middle range. So while it tends to be a fascinating way of getting a grant to spend a few years studying, it doesn't tell you much about individuals, who have an annoying habit of not fitting into neat categories. That applies even more to something as complicated as flying, than it does to simple physical characteristics. And especially to something that can be altered by practice, motivation, learning, experience, and a whole host of other things - you can't alter your height, but you can change your flying ability. So...interesting, perhaps...but only to the psychologists.