Kind of a shocking choice.
Isn’t this true though? Says more about Harvard than Summers to be honest.
https://www.swarthmore.edu/bulletin/archive/wp/january-2009_...
There are also more intellectually challenged men btw, but somehow that rarely gets discussed.
But the effects are quite small, and should not dissuade anyone to do anything IMO.
Here is a meta analysis on the subject: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057475/