A very, very impressive cluster randomized trial. Very hard to do! See thread for findings.https://twitter.com/Jabaluck/status/1433036923610742789 …
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Replying to @zeynep
Hugh Zahnar Retweeted Jason Abaluck
Summary: Masks work!* * except for cloth masks (they’re useless), for anyone under 50, and only in conjunction with increased physical distancing. And after all the, the author thinks vaccines are only “probably” better than masks …https://twitter.com/Jabaluck/status/1433129444940599296 …
Hugh Zahnar added,
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Replying to @HughDalton20
That's not the conclusion, well, I guess unless you don't know how to interpret randomized cluster trials.
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Replying to @zeynep @HughDalton20
i get what you're saying re: his points on people over 50 and distancing. but is his cloth mask conclusion incorrect (beyond maybe the overly-strong wording)? thanks, i've been hoping you'd do a thread on this :) !
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Yes, completely incorrect. The only conclusion is that surgical masks are better than cloth masks (important point) but the study design necessitates that effects would be very hard to detect. So can only compare in relationship within study, not declare anything ineffective.
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