[clarkm]

Thanks for that link. After looking through Appendix Table 2 (page 25), it's pretty obvious that the only big outlier is the gap in Israeli high-school students.

Here's a link to the (gated) paper with the data: http://www.sciencedirect.com/science/article/pii/S0047272708...

From the abstract:

  This paper tests for the existence of gender stereotyping and
  discrimination by public high-school teachers in Israel.
  
  Using data on test results in several subjects in the humanities 
  and sciences, I found, contrary to expectations, that male
  students face discrimination in each subject. These biases
  widen the female–male achievement difference because girls
  outperform boys in all subjects, except English, and at all levels of
  the curriculum. The bias is evident in all segments of the ability and
  performance distribution and is robust to various individual controls.

Ok, that was surprising. Does anyone have any more information about this?