That's purely a US figure. In western Europe, 60% of medical graduate are women (It's almost 66% in my country). Then more women drop out of this carrer path because they can, not because they are forced out. If I take a personal example, when studying at my university (in the top 15 QS global ranking), I had 6 girl friends that studied different fields, from physics to material science. Only one of them is still an engineer today. All by choice are now, yoga teachers, home consultant, mom at home, school teacher, etc. For my male friends maybe one decided to do something completely unrelated. I'm getting more and more suspicious about this world (at least in Europe) is unequal because of men. Women are making choice too.