2/n Study is here, as ever have a read. A very simple, nicely done RCT comparing the advice to wear masks with no such advice in Denmark:https://www.acpjournals.org/doi/10.7326/M20-6817 …
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3/n So, first point. This study says NOTHING about whether mask mandates are good public health policy Indeed, the authors themselves point this out in the discussionpic.twitter.com/jSa5O6VZXe
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4/n In fact, we already knew that telling people to wear masks (and providing them with masks) is a relatively ineffective way to stop them from getting a respiratory disease. Universal masking is more complex than that
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5/n The study DOESN'T show that masks are ineffective at preventing infection for the person wearing them I know it sounds weird, but it's true!
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6/n See, the authors powered their study (i.e. recruited participants) assuming that masks decreased your risk of infection by 50%, which is quite a lot!pic.twitter.com/WcBowCIJ7u
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7/n What the study actually shows is that advising someone to wear a mask doesn't reduce their risk of COVID-19 by ~50% or more~, but the results don't exclude smaller benefits
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8/n A reduction in risk of infection of 20% would be a bit meaningless to the individual but HUGE at a population level, so this is not a minor point
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9/n The study also DOESN'T show that WEARING A MASK is ineffective. It showed that PROVIDING MASKS AND TELLING PEOPLE TO WEAR THEM was ineffective ON TOP OF SOCIAL DISTANCING
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10/n As the authors note, compliance was pretty poor. Lots of people were told to wear masks, but didn't Hard to say what this means for an individual wearing a mask 24/7pic.twitter.com/2vnN12EpVI
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