Women get testosterone boost
Female athletes with higher levels of testosterone have a "significant competitive advantage" in a number of track and field events, researchers said.
Women with high levels of the hormone performed better in the 400 metres, 400m hurdles, 800m, hammer throw and pole vault.
Meanwhile, male sprinters showed higher levels of the hormone compared to male athletes from other disciplines.
The researchers from Monaco drew on 2,127 observations of best performances by elite male and female athletes, who were competing at the International Association of Athletics Federations World Championships.