@theogrin @KevinLikesMaps Let's do math here with NYC, population 8.4m.
1.6% are trans, and 20% of that are trans men (20% are trans women, 60% are nonbinary). That's 26,880 trans men in NYC. Of those, you need *only* those who are having SI (~40%), so 10,752. Of that, you need the folks who want HRT (~33%), for 3,548. Of THOSE, you need the guys who have not yet begun HRT, but have decided to get it. Then, only those who are willing to do an RCT.
That is a SMALL population, isn't it?
@Impossible_PhD @KevinLikesMaps
Not as small as it sounds, but also there's the question of outreach, of finding the population...
It's amazing they found as many as they did. I certainly don't scour the corkboard at the local market on a regular basis.