Of the groups I've been in recently, the core groups break down (female:male) as 1:2, 2:2, 2:5, 0:6, and 2:2. Adding in people who pass through but don't stay, it becomes 3:7, 2:3, 2:5, 0:9, and 4:2.
Too bad we don't have access to the core WotC stats from their survey. I'd be curious if the...