As part of their education indicators, Statistics Canada studies the gender-patterns of PhD matriculation and completion. They recently released a report here.
A snippet of the findings:
“According to recent data on college and university enrolments in Canada, women accounted for over half of all college enrolments (55%) in 2006/2007, as well as over half of all university enrolments in undergraduate (58%) and master’s (56%) programs in 2008/2009. At the doctoral level, however, the gender difference is reversed, with women accounting for less than half (47%) of students enrolled. Although the proportion of women earning doctorates has risen steadily over the last couple of decades, women accounted for less than half (44%) of all doctoral degrees granted in 2008.”