I know there are more (in America anyway) MD's who are male, but I'll bet the ratio of women is much higher regarding PHD's.
I hear there are more girls than boys attending colleges these days, so I wouldn't doubt that.
This reminds me of a friend of mine who had just gotten all schooling and internships out of the way, and moved back home to be a real, live pediatrician. She was still drivng an old, beat-up Japanese station wagon, from the days when Japanese cars were small and ugly. One day she parked this car in the lot and was heading to her office, when an employee at the building informed her that the space she was in was reserved for doctors. She has upgraded her transportation since then.