You might find this lecture interesting:
This passage in particular presents a different way at looking at the correlations in the Kane and Mertz study:
"Creativity may be another example of gender difference in motivation rather than ability. The evidence presents a seeming paradox, because the tests of creativity generally show men and women scoring about the same, yet through history some men have been much more creative than women. An explanation that fits this pattern is that men and women have the same creative ability but different motivations.
I am a musician, and I’ve long wondered about this difference. We know from the classical music scene that women can play instruments beautifully, superbly, proficiently — essentially just as well as men. They can and many do. Yet in jazz, where the performer has to be creative while playing, there is a stunning imbalance: hardly any women improvise. Why? The ability is there but perhaps the motivation is less. They don’t feel driven to do it.
I suppose the stock explanation for any such difference is that women were not encouraged, or were not appreciated, or were discouraged from being creative. But I don’t think this stock explanation fits the facts very well. In the 19th century in America, middle-class girls and women played piano far more than men. Yet all that piano playing failed to result in any creative output. There were no great women composers, no new directions in style of music or how to play, or anything like that. All those female pianists entertained their families and their dinner guests but did not seem motivated to create anything new.
Meanwhile, at about the same time, black men in America created blues and then jazz, both of which changed the way the world experiences music. By any measure, those black men, mostly just emerging from slavery, were far more disadvantaged than the middle-class white women. Even getting their hands on a musical instrument must have been considerably harder. And remember, I’m saying that the creative abilities are probably about equal. But somehow the men were driven to create something new, more than the women."