@AndreasShrugged do you know of any clinical RCTs showing mask efficacy (Covid)? @ScottAdamsSays has often said out that standard of evidence (either way) hasn’t been met. The only one I can find is the (discredited) Danish one.
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Why is it ethical to take a placebo for a control but it's not ethical to not wear a mask? Study participants know the risks upfront either way. I've always been curious about this distinction.
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(where not wearing mask is the "control" ... Or the experimental group, I guess, depending on your frame of reference)
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That's why researchers also compare treatment and control states before the adoption of a policy. It doesn't rule out other variables, but if the difference in cases is statistically zero, it gives more credibility to the later comparison.
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A nice setting would be that all states simultaneously implemented mask mandates but only half of them got masks before a breakdown in supply chains. :)
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