I wrote about That New Mask study and what it actually means to you #Danmask19https://gidmk.medium.com/what-the-new-covid-19-mask-study-means-for-you-eab2b824e36a …
I think it's the one take-home from the trial that you can reasonably make. While it may have been a tad underpowered for even this finding, I think there's reasonable evidence now that a mask won't halve the risk for an average person
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the Danish study used surgical masks. in the JAMA study I cited, surgical masks with ear loops were only 38% effective in filtering out 0.05 μm aerosols (which is admittedly too small a particle size to be looking at). KN95 masks were ~80% effective. my point: mask type matters
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Maybe, but I think the effectiveness of surgical masks vs N95 in the community is unlikely to enormously modify the effect, given that <50% of people actually wear them as advised anyway
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