How can these studies be conducted if it is illegal for transwomen to compete against cis gender women? We have some information about how transgender athletes are comparing with cis gender athletes by looking at places where it is happening now, aside from Lia Thomas and a couple of track stars in Connecticut, transgender women don't seem to be dominating. Even though Lia is winning a lot of races in the Ivy league she doesn't hold any NCAA records so other cis gender athletes have better times.
Here is part of an article I found interesting, I'll post a link so you can read the whole thing if you are interested:
I say “theoretical” because it’s unclear that transgender females really are physically superior to cisgender females. As Dr. Jack Turban, a fellow in child and adolescent psychiatry at Stanford University School of Medicine, told public radio in May 2021, cisgender men may perform better than cisgender females, “but a cisgender man is not a transgender woman.” The hormone treatments many transgender females receive limit or eliminate any potential testosterone benefit. The rare transgender female who plays sports may have little advantage – or no advantage at all.
California has let students choose whether to play boys’ or girls’ sports based on their self-perception, regardless of their birth gender, since 2013. Nonetheless, in a state with nearly 40 million people, no transgender girls are dominating sports leagues, Turban noted. If they were, transgender rights opponents are sure to say so.
The common sense: Athletes of any gender can have a genetic edge, such as a 6-foot, 1-inch cisgender female volleyball player, a long-legged cisgender female hurdler, or a big-boned cisgender female softball catcher. Athletes everywhere capitalize on genetic differences to win in sports.
But success goes beyond genetics to natural ability, dedication and training, all accessible to anyone. Ask any guy who’s had a woman hand him his head on a basketball court or softball diamond.
So, if the risk of a transgender female dominating an Iowa sport is insignificant, there must be another reason Iowa Republicans want to block them.
I wonder what it is.
Math, science and common sense find that Iowans "needn’t fear that legions of muscular former males will grab all the trophies and medals."
iowacapitaldispatch.com