12/n So the authors have cherry-picked their interventions, cherry-picked their locations, and as others have identified done quite a few other questionable things as well It is ~very~ frustrating to see
All of the duration variables are also calculated in a very strange way. In many cases the first case/death was on recent arrival to the country, so this is likely to skew their analysis quite a bit. Rather that they just used the date of the first case being identifiedpic.twitter.com/sKHnAB92g0
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In terms of their findings with regards to masks, this makes me very hesitant to accept any of the conclusions - they are all based on a 'duration' variable which is opaque and may not really reflect reality
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More broadly, there is the classic issue here with the ecological fallacy - we don't actually know if any of these variables substantially impacted mortality because all of the metrics are too high level
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