@StevenSaus but the early findings is only looking at ages 18+, while the full study will include data on 16 and 17 years old where id assume the gaps will probably widen with an increase in nonbinary people and increase in transmasc to transfem. Still, the youngest bracket of ages 18-24 was the largest group at 43% of all respondants.
i think the strong societal force of transmisogyny towards transgression of gender boundaries into femininity by any amab body is potentially a significant factor to consider.
A nonbinary transfeminine person who's gender expression is feminine is going to be considered to have transgressed, and to try and simplify things here, lets say they're taking on significant risk/danger in their daily life.
Which i think may have a squeezing effect on the nonbinary transfeminine group statistically, either pressuring people to not take the transgressive step, or to move into identifying as a trans woman since the transgressive boundary is already passed and there is no greater societal stigma to be gained from doing so. But thats conjecture and anecdotal.