The PT article is called "Women in Physics: A Tale of Limits" by Rachel Ivie and Casey Langer Tesfaye (Feb. 2012). In 2009 and 2010, the Working Group on Women in Physics of the International Union of Pure and Applied Physics did a large international survey to determine the status of women physicists worldwide. They surveyed 15,000 women and men physicists from 130 countries, asking questions to reveal where women may be limited in their careers.
Results are given related to career-advancing activities that respondents experience. Examples are invited speaker at conferences, leader of a group, editor of a journal and serving on conference organizing committees. They gave the numbers and I couldn't resist doing my own analysis. Here is my summary plot of the ratio of women to men experiencing different activities as a function of the importance of the activity.