Excuse me while I get fucking MAD about the abuse of statistics by the trans lobby.
First, Djehne et al. They DID NOT find that post-1990 transexuals are criminal at the same rate as women.
They lumped trans men and trans women together in the post 1990 group as FPFW pointed out. The only part of that study which directly compared transwomen with women showed TW 40 times more likely to commit a violent crime.
And even more importantly, there aren't that many violent crime convictions in this study. The main reason they didn't find a difference in the second group is that when they divide the sample into two, N is too small to detect the difference in crime rates.
The trans lobby have lied about this consistently. Djehne et al didn't detect "no difference." They just failed to detect a difference. When you don't find something, it doesn't mean it isn't there. It could be just because you haven't got your glasses on. In this case dividing the data into two groups is the equivalent of taking your glasses off so you can't see the elephant in the room.
And speaking of, that stupid study about bathrooms and crime rates. Exact same deal. They failed to detect a difference in reported crimes after trans bathroom laws were passed. Is that because there is no difference? Or because the methods they used didn't have the statistical power to detect a difference? No normal statistical study would report "we found no result" as if it was an actual result, and if it did it wouldn't get published,. but special rules apply to trans statistics.
I've seen this exact fallacy in trans-agenda neuroscience too! Well, our tests didn't find anything so we'll assume this proves our point. All you're proving is that you don't understand statistics! I never see that fallacy in any other topic, I swear to god. I never wonder if the authors of a non trans related paper might have deliberately taken their statistical glasses off (reduced the power of their analysis) because in normal academic topics authors aren't incentivised to not find the elephant in the room.
But when it comes to all things trans, I guess if their findings identify as valid that's good enough. Thank fuck this trend of not questioning TRA-friendly bullshit statistics has been comprehensively called out, with that backlash to the AJP article.