No, of course not.  But pointing out that 91% of nurses are women as an encouragement about how women have a position in STEM fields doesn't serve much in the way of swaying an argument in an encouraging direction.  Not only that, but the fact most nurses don't consider themselves to be in a STEM position also comes into play.    What I'm saying, essentially, is that if you want to say, "Sure, women have plenty of STEM careers! 91% of nurses are women!" I'm not really going to feel much better about the lack of women in STEM fields.