The notion of transgender girls having an unfair advantage comes from the idea that testosterone causes physical changes such as an increase in muscle mass. But transgender girls are not the only girls with high testosterone levels. An estimated 10 percent of women have polycystic ovarian syndrome, which results in elevated testosterone levels. They are not banned from female sports. Transgender girls on puberty blockers, on the other hand, have negligible testosterone levels. Yet these state bills would force them to play with the boys. Plus, the athletic advantage conferred by testosterone is equivocal. As Katrina Karkazis, a senior visiting fellow and expert on testosterone and bioethics at Yale University explains, “Studies of testosterone levels in athletes do not show any clear, consistent relationship between testosterone and athletic performance. Sometimes testosterone is associated with better performance, but other studies show weak links or no links. And yet others show testosterone is associated with worse performance.” The bills’ premises lack scientific validity.
Claiming that transgender girls have an unfair advantage in sports also neglects the fact that these kids have the deck stacked against them in nearly every other way imaginable. They suffer from higher rates of bullying, anxiety and depression—all of which make it more difficult for them to train and compete. They also have higher rates of homelessness and poverty because of common experiences of family rejection. This is likely a major driver of why we see so few transgender athletes in collegiate sports and none in the Olympics.
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