How is transgender – a very, very small population – classified as a “key population” as Beth claims?

Not asking a question does not mean “exclusion” Beth. There is no question about impotence either. Or baldness. I admit to the latter. Having a biased estimate of pr(transgender) will not allow anyone to measure progress or target funding, notwithstanding that we will not agree on what progress is.

What policy decision would follow from a survey of unverified claims of transgender status? I am sure you know that there are schools in the US where fully 20% of students claim to be transgender or non-binary. If researchers are interested in measuring the true proportion – and what is generating the claim – they can fund their own surveys surely.