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
Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him
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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
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
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 
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
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
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
It does not, that is incorrect. The study shows a statistically significant correlation between having a covid diagnosis and wearing glasses. The distinction may seem minor, but it is extremely large
Ah, and how do you know that not having COVID is correlated with wearing glasses?
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