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[ny_quant]

Оказалось, что cloth masks are completely useless so that Europeans are banning them in planеs and surgical masks are only ~10% effective (for unvaccinated people).

Интуитивно, мне кажется, что для вакцинированных установить статистически достоверный эффект хоть каких-то масок не удастся.

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[misha-b.livejournal.com]

Before the intervention ~10% were wearing masks, after ~40%, so it is 10%* (100/(40-10))~33% I think.

In any case, it is not as good as vaccination but far better than nothing. I think this justifies indoor mandates when significant part of the population is unvaccinated as long as surgical masks are required. Hard to say anything definitely about vaccinated people but their risk is far smaller in any case.