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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(Don't get me wrong, I'm a big fan of randomization when we can. I'd give out a good chunk of scientific grants randomly if I could. Randomization is amazing and powerful. But population level measures/history etc. cannot be randomized, so lab+natural experiment it is).
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There is a state mandate study (but yes confounded but at least confirms no harm/no false sense of security). https://www.healthaffairs.org/doi/10.1377/hlthaff.2020.00818 …
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