You could probably test this by looking at different work environments outside of Silicon Valley or even the US.
Also, a few years ago I read a NYT opinion article citing research into what teams perform best. It wasn't all that dependent on IQ, but on those where where, everyone contributes more equally, people were better at reading each other's emotional state, and which had more women[0][1]. It should be noted that women are better on average at reading emotional states, and that being better at reading each other's emotional state may play a big part in having everyone contribute equally.
[0] https://www.nytimes.com/2015/01/18/opinion/sunday/why-some-t...