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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
Verified account
@GidMK

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Health NerdVerified account

@GidMK

Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him

Sydney, New South Wales
theguardian.com/profile/gideon…
Joined November 2015

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    1. Jonas Vlachos‏ @jonasvlachos Feb 11

      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 …

      9 replies 101 retweets 264 likes
      Show this thread
    2. Health Nerd‏Verified account @GidMK Feb 11
      Replying to @jonasvlachos

      Interesting study. It seems to me that the reliance on testing data, which was I believe at that point mostly done in hospitals in Sweden, might be a pretty significant limitation but I can't see this discussed?

      1 reply 2 retweets 14 likes
    3. Jonas Vlachos‏ @jonasvlachos Feb 11
      Replying to @GidMK

      Well, a limitation in some regard but it means that testing bias is less of an issue (some groups more prone to get tested when testing is readily availble). Alos, we make use of data on diagnonses from healthcare visits and hospitalizations. It is discussed.

      2 replies 1 retweet 8 likes
    4. Health Nerd‏Verified account @GidMK Feb 11
      Replying to @jonasvlachos

      Sure, but we know that age is a significant factor in the likelihood of an asymptomatic/very mild infection, so it's not unlikely that there is a substantial fraction of transmission that would be impossible to identify using confirmed PCR+ cases at the time

      2 replies 1 retweet 9 likes
      Health Nerd‏Verified account @GidMK Feb 11
      Replying to @GidMK @jonasvlachos

      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

      3:06 PM - 11 Feb 2021
      1 reply 1 retweet 3 likes
        1. New conversation
        2. Jonas Vlachos‏ @jonasvlachos Feb 11
          Replying to @GidMK

          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).

          1 reply 0 retweets 0 likes
        3. Health Nerd‏Verified account @GidMK Feb 11
          Replying to @jonasvlachos

          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

          2 replies 1 retweet 5 likes
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