13/n Especially since I am not against masks! The point here is not that masks do or do not work, it is that this paper provides absolutely no evidence either way and is largely useless at determining cause and effect
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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For example, most deaths in China happened in Wuhan/Hubei, but they've reportedly used the nationwide statistics for most variables. That's an issue, because Wuhan may not be representative of the whole country!
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