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Fact check: Percentage of trans women to compete in womens sports

Checked on September 12, 2025

1. Summary of the results

The original statement inquires about the percentage of trans women competing in women's sports. However, upon reviewing the analyses provided, it becomes clear that none of the sources provide a specific percentage of trans women competing in women's sports [1] [2] [3] [4] [5] [6] [7] [8] [9]. The analyses do suggest that trans women make up a tiny fraction of all athletes [1] and that their inclusion in women's sports has not negatively affected women's sports [7]. Some sources mention specific cases, such as the participation of Lia Thomas, a transgender swimmer, in the University of Pennsylvania's women's swimming team [4], and the lawsuit filed by three young women in California against the inclusion of a biological male transgender athlete on a girls' volleyball team [6]. Additionally, a poll found that 25% of American adults believe trans women should be allowed to participate in female sports, with 36% of Gen Z respondents supporting this [2].

2. Missing context/alternative viewpoints

A key missing context in the original statement is the lack of scientific evidence to support policymakers' attempts to ban transgender women in sports [3]. Additionally, some sources highlight the physical disadvantages that trans women may have when competing with cisgender women [3]. The analyses also mention that states that include transgender participation have more girls participating in sports than states with bans [1]. Furthermore, the NCAA changed its rules to limit competition in women's sports to student-athletes assigned female at birth only [2], which may impact the participation of trans women in women's sports. Alternative viewpoints include the argument that trans athletes represent a tiny fraction of competitors and their inclusion has not negatively affected women's sports [7], and that research shows that states that include transgender participation have more girls participating in sports than states with bans [1].

3. Potential misinformation/bias in the original statement

The original statement may be misleading as it implies that there is a significant percentage of trans women competing in women's sports, when in fact, none of the sources provide a specific percentage [1] [2] [3] [4] [5] [6] [7] [8] [9]. Additionally, the statement may be biased towards implying that trans women's participation in women's sports is a significant issue, when in fact, the majority of sources suggest that trans women make up a tiny fraction of all athletes [1] and that their inclusion has not negatively affected women's sports [7]. The sources that mention specific cases, such as the participation of Lia Thomas [4], may be sensationalizing the issue, while sources that highlight the lack of scientific evidence to support policymakers' attempts to ban transgender women in sports [3] may be downplaying the concerns of some individuals. Overall, the original statement may benefit those who oppose the participation of trans women in women's sports, while the sources that provide alternative viewpoints may benefit trans women athletes and advocates for trans inclusion in sports [1] [7].

Want to dive deeper?
What percentage of trans women athletes compete at the collegiate level?
How do different sports organizations regulate trans women's participation?
What are the arguments for and against trans women competing in women's sports?
Have there been any notable cases of trans women dominating women's sports competitions?
What is the current policy on trans women's participation in the Olympics?