Reason that past clinical studies, focusing on health-care worker outcomes, are not the best indicator is that masks for *source-control* is not an individual level variable. It's like asking if filters on car exhausts lower air pollution by measuring the air ... inside each car.
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We've since had natural experiment papers (comparing countries mask wearing/not). For this kind of variable, community-wide rather than individual, that's the best measure. Most of the confusion here is not realizing the source-control can't be measured with individual outcomes.
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We didn't have many COVID specific studies at the population level at that paper (next update will include the natural experiment papers.) The reason I posted that is the source-control argument is important to acknowledge. Really changes what study is applicable to this.
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