I could add something much more targeted as well. These are data from the national apprenticeship survey. We have to bear in mind that it's not a huge sample.
Men and women were asked to give the reasons why they did not complete their apprenticeship program. For women, the top-ranking reason, although it was still for only about 16% of women, was family responsibilities. Second was financial reasons. The top for men was financial and that they got a better job offer.
So if we look specifically at the trades, child care does seem to be one of the reasons that prevent women from completing, bearing in mind that there are relatively few women in trades to start with.