In 2013 the Dutch Wikimedia chapter hired an external party to conduct a
survey. The study was split into two parts; one on the contributors and one on the
users, aka readers. Users were 50/50 male female. Contributors
were 88% male, 6% female, and 6% would not say. post 
.
Unrelated correspondence has suggested this familiar imbalance biases the conflict arbitration in the part of Gamergate that is spilling over into the encyclopedia.