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
Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him
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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
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
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!
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
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
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
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
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
11/n Moreover, there was a lot of social distancing already going on in Denmark at the time - this means that we can't really say that MASKS are ineffective but rather than masks didn't reduce infection numbers significantly on top of social distancingpic.twitter.com/ciSXYlyR3n
Klaus K Retweeted Klaus K
No - you are completely wrong about social distancing in my country.https://twitter.com/KlausKblog/status/1329992601760653312 …
Klaus K added,
So when the authors say that the country was "still under lockdown" they are using a different meaning of the word?
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