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.
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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