Looking over Wikipedia's article on adoption in Ancient Rome, I notice that it mentions that adoption of females "was much less common" than adoption of males. I don't see any sources for that statement, though one female adoptee is mentioned: Clodia.
As best as scholars can tell, what was the approximate rate of adoption of females in comparison to males in Ancient Rome? I'm particularly interested in the late republic/early empire years (perhaps 200 BC to 200 AD), if that helps narrow the question.