That Bryce and Rutter research could be true even to South Africa.
IMO, a lot of females just don't speak openly or interact with other members of the gaming community as intensely as they would like to out of fear of some kind of retribution because gaming is supposed to be for 'boys'.
One of my friends' wife decided she is also going to start gaming. I haven't asked how far that has gone but he was saying he jams a few games with her. That was 2 years ago. Don't know now.