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Bermon and Garnier1 summarised their recent findings by stating that in 5 of 21 events, ‘female athletes with high testosterone levels benefit from a 1.8% to 4.5% competitive advantage over other female competitors with normal androgen levels’. As the authors did not divide female athletes into comparison groups based on a value of free testosterone (fT) determined a priori to be ‘high’, the study’s design does not allow for this conclusion. Given the authors contextualise the study using the Court of Arbitration for Sport’s (CAS) suspension of the International Association …
Contributors The thoughts expressed in this correspondence are my own, the text was drafted and content of a substantial nature was critically revised over several versions by myself, I alone responded to the reviewers' comments, and I alone have final approval for this manuscript’s publication.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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