A recent study found that the disparities between boys and girls in math are related to gender inequality. The article is available for free if you follow the link provided on the abstract page.
Of course, you should have known that already.
This post refers to:
Janet S Hyde and Janet E Mertz, “Gender, culture, and mathematics performance,” Proceedings of the National Academy of Sciences of the United States of America 106, no. 22 (June 2, 2009): 8801-8807, doi:10.1073/pnas.0901265106.