Its totally fine to recommend masks & to note strengths & limits w data
But let's not go overboard and claim a cluster RCT was impossible. It certainly was possible in March. @mgtmccartney
Here is what is wrong with this op-ed: [thread]https://www.nytimes.com/2020/11/06/opinion/sunday/coronavirus-masks.html?smid=tw-share …
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@zeynep If you haven't already, can you address this MIT study? It seems like a promising detection of asymptomatic Covid19 carriers. https://news.mit.edu/2020/covid-19-cough-cellphone-detection-1029 …Thanks. Twitter will use this to make your timeline better. UndoUndo
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You would need to do community level randomization with incidence as the outcome — like test and treat studies for HIV in Sun Saharan Africa, which gets at the treatment as prevention paradigm. They are difficult trials but can be done.
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The intervention would not be mask / no mask but rather free masks on every corner, mask mandates indoors+/- outdoors, messaging campaigns
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Likely interesting data available on eg meat plants: After the famous outbreak in Germany where a large % of workers were infected despite wearing (single layer) masks, higher quality masks were recommended. I assume many plants made changes. Interesting comparisons possible.
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Comparisons before/after, and betw plants where higher quality masks were used & where they weren't. This would also capture protective effect via source control. Difficulty is that there likely were also improvements made re other precautions, so difficult to isolate mask effect
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I had suggestions here
and in a reply a little further down.
Short of doing any new research, we could at least shift to emphasizing good masks (N95's, KN95's) for self-protection, especially for vulnerable pop's, where evidence of benefit is clearer?https://twitter.com/WesPegden/status/1322953935028707328 … -
Here was the reply further down.https://twitter.com/WesPegden/status/1322957729221255170 …
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