In the end, there was no statistically significant difference between those who wore masks and those who did not when it came to being infected by Covid-19. 1.8 per cent of those wearing masks caught Covid, compared to 2.1 per cent of the control group. As a result, it seems that any effect masks have on preventing the spread of the disease in the community is small.
…there is a troubling lack of robust evidence on face masks and Covid-19…The only studies which have shown masks to be effective at stopping airborne diseases have been ‘observational’…But observational studies are prone to recall bias: in the heat of a pandemic, not very many people will recall if and when they used masks and at what distance they kept from others.
Danmask-19 Trial
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