... they found cloth masks to be better than nothing, which was not a finding of the paper.
You’re really misunderstanding measurement. You can’t do an RCT for transmission like you can for protection.
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Is that true though? This BMJ letter had an interesting suggestion about using schools as a way to do an experiment. https://www.bmj.com/content/370/bmj.m3473 …
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And this paper cited two source control RCTs, one involving household spread and one involving mask and non-mask tents for Hajj pilgrims. Neither seems great, but they demonstrate that we can get creative with RCT design and that they aren’t impossible. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7191274/ …
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