Now, let's get more specific. Most studies aren't generalizing to global trans populations but specific country or regional populations that are going to share more cultural, material, and social conditions. So, for example, US population is 300 million, so our trans population we're generalizing to is 3 million. The thing is, we know how distribution curves work in populations and at 3 million people, you actually only need a few thousand to be able to accurately generalize to 99.7% of that (depending on a range of factors, could be even lower or higher).
Now, let's focus in more: most studies aren't making claims about even the whole trans population or even the whole trans youth population: they are making claims about trans youth served at a specific clinic or health system.
JoscelynTransient