So, The Big Mask study has been published, and I thought rather than expound on what the results DID show (everyone's doing that), I might point out a few things that they DIDN'T show 1/npic.twitter.com/zG4jtXQVVq
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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So, The Big Mask study has been published, and I thought rather than expound on what the results DID show (everyone's doing that), I might point out a few things that they DIDN'T show 1/npic.twitter.com/zG4jtXQVVq
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 …
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
Yes it did exclude smaller benefits. The conclusion is clear. "A recommendation to wear a surgical mask when outside the home among others did not reduce, at conventional levels of statistical significance, incident SARS-CoV-2 infection compared with no mask recommendation."
Have a read up on statistical power, check their sample size calculations, and get back to me
No, you do that. You are fact-checking the study, I am fact-checking you. 
Lol, well you're wrong and have misunderstood it so like I said, have a read of sample sizes, power calculations, and get back to me 
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