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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
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@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. Health Nerd‏Verified account @GidMK Feb 22

      3/n Some background here - traditionally, in epidemiology, to work out whether something is protective against disease, you need to know two basic things: 1. Likelihood of disease if exposed 2. Likelihood of disease if not exposed

      2 replies 4 retweets 71 likes
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    2. Health Nerd‏Verified account @GidMK Feb 22

      4/n Essentially, to know whether glasses make you less likely to catch COVID-19, we'd need to know whether people with glasses caught the disease less than people without glasses Simple, right?pic.twitter.com/1GxB0YwOuD

      1 reply 3 retweets 54 likes
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    3. Health Nerd‏Verified account @GidMK Feb 22

      5/n Ok, back to the study What did the author do? Well, the asked 304 people with COVID-19 whether they wore glasses most/all of the time. 58 (19%) said yespic.twitter.com/ct1P60oIgK

      1 reply 8 retweets 52 likes
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    4. Health Nerd‏Verified account @GidMK Feb 22

      6/n Then, the author took the proportion of Indian adults estimated to wear glasses from a paper in 2019, to compare this sample topic.twitter.com/tYRVgFZElZ

      1 reply 4 retweets 49 likes
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    5. Health Nerd‏Verified account @GidMK Feb 22

      7/n So far so problematic. You can't just compare to an out-of-study population like that, it makes no sense at all. If nothing else, the comparison group is for the whole of India, while this survey was done on a tiny subsample in one hospital 😬

      1 reply 7 retweets 104 likes
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    6. Health Nerd‏Verified account @GidMK Feb 22

      8/n But then, we get to these calculations, which are described as "the risk of [catching] COVID-19" in glasses wearers vs non-wearers But...that's just incorrectpic.twitter.com/bkyRhQkwT3

      2 replies 6 retweets 56 likes
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    7. Health Nerd‏Verified account @GidMK Feb 22

      9/n What the author has done here is compare the rate of glasses wearing in COVID-19 patients to the rate of glasses wearing in the general populationpic.twitter.com/wwC3Mw2qHQ

      2 replies 7 retweets 65 likes
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    8. Health Nerd‏Verified account @GidMK Feb 22

      10/n What this calculation actually gives you is the likelihood of wearing glasses in COVID-19 vs non-COVID-19 people In other words, what we've got here is the relative risk of glasses-wearing behaviour in COVID-19 patients compared to everyone else

      1 reply 11 retweets 113 likes
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    9. Health Nerd‏Verified account @GidMK Feb 22

      11/n So not only is the study a tiny cross-sectional survey with no appropriate comparator, it's also not calculating what the headlines (and conclusions) say it is at all

      1 reply 7 retweets 73 likes
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    10. Health Nerd‏Verified account @GidMK Feb 22

      12/n What the headlines should say is that COVID-19 patients are 2-3 times less likely to wear glasses than the general population, based on a small, biased survey But I doubt that will get as much attention, because it's a bit meaningless

      1 reply 22 retweets 118 likes
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      Health Nerd‏Verified account @GidMK Feb 22

      13/n Here is the conclusion of the study. This is not correct based on the methodology as described:pic.twitter.com/SRaHx0zzZ8

      3:53 PM - 22 Feb 2021
      • 6 Retweets
      • 54 Likes
      • 高遠 Lady_Magpie Hinnack69 Matt Whitehead Jennifer Colbourne, M.Rcc🦜🏳️‍🌈🇨🇦 prog Nina Niskanen Sean / tag: RedComet 🏴Ⓐ🐙 Compañero Allende 🐙Ⓐ🏴
      3 replies 6 retweets 54 likes
        1. Health Nerd‏Verified account @GidMK Feb 22

          14/n Oh and in case anyone was wondering, according to Altmetric the study has been in 51 news articles so farpic.twitter.com/dSFahe908r

          10 replies 6 retweets 80 likes
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        1. Vi Something-Or-Other‏ @violsvn Feb 27
          Replying to @GidMK

          As a wearer of glasses, I would also like to see a citation for the assertion that they cause one to touch one's eyes *less*.

          0 replies 0 retweets 0 likes
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