It lays out two requirements for trans women who are members of USA Swimming: The concentration of testosterone in their blood must be less than 5 nanomoles per liter continuously for at least 36 months before they apply to compete, and they must provide evidence that going through puberty as their sex assigned at birth “does not give the athlete a competitive advantage over the athlete’s cisgender female competitors.”

A panel of three independent medical experts will be charged with reviewing applicants and implementing the policy.

In a news release Tuesday, USA Swimming cited statistical data comparing male and female cisgender athletes, who identify with their sex assigned at birth, that shows that the top-ranked woman in 2021, on average, would be ranked much lower in male events across short and long swimming distances.