I am presuming the research cited is the Chu et al review in @TheLancet. I’m not sure that’s the best source of evidence when it comes to mask use in the community vs healthcare because of training in the latter setting and confounders https://twitter.com/bencowling88/status/1269139370121953280?s=21 … is 5/n
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So, I don't think people arguing masks should have been encouraged/mandated were "brave" despite lack of high-quality evidence; rather, I think the other "side" (painfully included WHO and CDC at first) acted contrary to evidence, made baseless claims and ignored actual evidence.
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So I consider myself risk-averse when it comes to evidence and demanding of highest-quality possible with careful consideration to risks on all sides of the decision.
(And HK/Taiwan/S Korea etc. certainly have excellent infectious disease specialists and were ahead of us/WHO). - Show replies
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An aside: why can't we have an RCT, with an encouragement design and IV specification? Eg provide free masks, cluster-randomised by workplace? This seems doable and important.
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I had this exact discussion early on with people on how to try but I couldn't see an ethical context or a workable framework during a pandemic. Rich countries? People will mask up, cost little issue. Poor countries? Given evidence "for" side, how do you withhold? Plus, not blind.
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