Sigh. Authors are unaware of Simpson&#x27;s paradox. Such analyses are meaningless if you don&#x27;t control for such obvious factors as the distributions of projects people of different genders choose to contribute to. See the classic college admissions bias study to understand why: <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Simpson%27s_paradox" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Simpson%27s_paradox</a>