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I wonder how they do these studies to accommodate trans men. Is it allowed to filter these studies on birth sex rather than gender?

I can’t find good stats on the percent of trans men in the population but I imagine it’s both low, and increasing from 2007 to now.

May not be significant enough to affect the study if it includes some from random sampling, but I imagine trans men have lower testosterone than non-trans men.

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Filtering by birth sex makes sense, this is a biology study, so any treatments trans men are receiving could taint the data. Though, by that logic, they should also ignore obese men, since they also have lower testosterone levels. It's a complex issue as to who to ignore really based on their life style choices.

Selection of participants should be driven by the hypothesis being tested, not abstract ideas about who is a man and who is obese.

Who is a man and who is obese are not abstract ideas. We have very strict criteria to filter by these.

Maybe a poor choice of words, but the hypothesis under test should make clear who is reasonable to exclude.

Is it really that hard to understand why they should focus on real men instead of artificially created men?

I think it is very unlikely that transgendered folks are being included in this survey.

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