Out in PNAS: "The effects of school closures on SARS-CoV-2 among parents and teachers". On March 18, 2020, upper secondary schools in Sweden moved online while schools for younger students remained open. 1/n https://www.pnas.org/content/118/9/e2020834118 …
I get that this is potentially non-differentiated between the comparison groups, but it is plausibly also something that could vary. Not to say that it invalidates the findings of course
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Basically, the only thing that differentiates those with kids in final year in lower secondary and first year in upper secondary is one year of age. We also have a host of controls (as mentioned) but dropping these does not affect the results (as expected).
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Sure, but I'm not sure that mitigates the limitation here. The fundamental issue is that the outcome measure is a biased estimate of the true infection rate, and I suspect that the true impact of that bias on different populations is very hard to estimate
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