Reference: J. Terrell1, A. Kofink, J. Middleton, C. Rainear, E. Murphy-Hill, C. Parnin (2016). “Gender bias in open source: Pull request acceptance of women versus men.” PeerJ PrePrints 4:e1733v1 https://doi.org/10.7287/peerj.preprints.1733v1
The researchers looked at approximately 3m pull requests submitted on GitHub, and found that code written by women was approved at a higher rate (78.6%) than code written by men (74.6%).
… “Women’s acceptance rates dominate over men’s for every programming language in the top 10, to various degrees,” the researchers found.
… they made the disturbing discovery: women’s work was more likely to be accepted than men’s, unless “their gender is identifiable”, in which case the acceptance rate was worse than men’s.