3 vs 16 seems like quite a difference, even allowing for the small sample size. Is this consistent with the larger population?
What struck me was not the difference in numbers of FtM and MtF, but the fact that more than ten percent of the survey population identifying as female is MtF.
What struck me was not the difference in numbers of FtM and MtF, but the fact that more than ten percent of the survey population identifying as female is MtF.