[user104658]

They didn't really need a massive study tbh it's fairly obvious if you look at any anecdotal example of groups of 10 to 13 year olds (roughly). Real body dysmorphia and trans people DO exist now, just as they have throughout civilisation, but the massive upswing in gender identity "stuff" post-2020 was, to put it simply, a trend or fad... and as trends or fads do... it moved on.

Unfortunately, small but very loud campaigning groups (Stonewall/Mermaids being the flagship example, but there are others) that existed long before said fad managed to use the illusion of this fad to push through agenda-driven policies at company and government level in various places... and that's going to be harder to untangle.