jms's blithe dismissal reminds me of one of the great educational achievements of my undergrad physics tutor (FRS, professor of astrophysics, woman...)
The "received wisdom" in my university had pretty much matched jms's view: women were dull plodders who got 2.1s and 2.2s, while a lot of men fell in this bracket, they were also the group that got the 1sts and the 3rds (brilliant, or lazy). It appeared that the stats did indeed bear this out - more men than women got 1sts.
Then my tutor pushed very hard to get blind marking introduced, so exam markers no longer knew whether the scripts they were marking were from women or men... and, suddenly, the discrepancy disappeared. Women started getting as many 1sts as men (proportionate to the numbers of women on the course).
Funnily enough, this pattern gets repeated all over the place... Malcolm Gladwell has an interesting chapter in one of his books on introducing blind auditions for orchestral places, where players performed behind a screen. Again, suddenly women started getting appointed to roles (principal trumpet, etc.) that they just hadn't got anywhere near in the past.