A Cambridge study found fewer children exercise where a uniform is worn.
Cambridge University used physical activity data of more than a million five-to-17-year-olds internationally.
It found that in countries where more schools require students to wear uniforms, fewer young people met the average of 60 minutes of physical activity per day.
Across most countries, fewer girls than boys reach those recommended exercise levels.
However, the difference in activity between girls and boys was found to be wider in countries where most schools mandated uniforms.
This was especially noticeable at primary school ages.
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