A very good thread on that Danish mask paper
https://twitter.com/trishgreenhalgh/status/1329163949732933633 …
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I'm still not clear on what's wrong with "If you get infected in that period, the incubation period may be up to 14 days, so you may not turn positive till after the end of the study."
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It doesn't matter in terms of the results of the trial. Unless the suggestion is for an effect that differentiates between arms, they still had enough cases to detect a 50% difference even if lots of people were infected but couldn't be detected
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