Norwegian Researchers Find Masks Linked With Covid Infections

Norwegian Researchers Find Masks Linked With Covid Infections

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Originally published by Guy Gin on The Daily Sceptic

All links to previous Gospa News investigations have been added aftermath, for the ties with the topics highlighted 

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A new peer-reviewed study by Norwegian researchers has recently been published titled “Association between Face mask use and Risk of SARS-CoV-2 Infection – Cross-sectional study”. In case you didn’t already know, a cross-sectional study “is a type of observational study that analyses data from a population, or a representative subset, at a specific point in time”, in this case early 2022. However, the data were collected during an RCT of wearing glasses. So what kind of association did they find?

We examined the association between face masks and risk of infection with SARS-CoV-2 using cross-sectional data from 3,209 participants in a randomized trial of using glasses to reduce the risk of infection with SARS-CoV-2. Face mask use was based on participants’ response to the end-of-follow-up survey. We found that the incidence of self-reported COVID-19 was 33% (aRR 1.33; 95% CI 1.03 – 1.72) higher in those wearing face masks often or sometimes, and 40% (aRR 1.40; 95% CI 1.08 – 1.82) higher in those wearing face masks almost always or always, compared to participants who reported wearing face masks never or almost never.

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Oh dear. And these are the results after controlling for observable confounders. In the raw data, regular mask-wearers had a 74-75% higher risk of testing positive for Covid.

The crude estimates show a higher incidence of testing positive for COVID-19 in the groups that used face masks more frequently, with 8.6% of participants who never or almost never used masks, 15.0% of participants who sometimes used masks, and 15.1% of participants who almost always or always used masks reporting a positive test result. The risk was 1.74 (1.38 to 2.18) times higher in those who wore face masks often or sometimes and 1.75 (1.39 to 2.21) times higher in those who wore face masks almost always or always, compared to participants who reported never or almost never wore masks.

Well, this is embarrassing for the pro-maskers, isn’t it? Frankly, I think you’d need a heart of stone not to laugh at these results.

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So does this study prove that masks actually increase your risk of catching Covid? No. The authors mention various possible biases that could have affected the results.

A major limitation of our study is the non-randomized, cross-sectional study design. It may be that mask wearers were more prone to wear masks to protect others from their own infection. This reverse causality may explain the positive association between risk of infection and mask usage, and could be supported by the finding that participants reporting to wear masks also were more likely to test themselves for COVID-19. Furthermore, there may be other behavioural differences related to perception of risk or occupation that we did not observe, that are linked to the likelihood of wearing mask or to the likelihood of being tested for COVID-19 when symptomaticThere is also the possibility that mask wearers feel somewhat protected and thus change their behaviours to not observe social distancing, so that any benefit of masking is offset by increased exposure. Lastly, our main outcome was based on self-report, which is also a possible source of bias.

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I think these are all valid points. Norwegians who did/didn’t wear masks in early 2022 probably did work in different jobs and behave differently outside of work too, and some may have worn masks because they tested positive. Without randomising people into groups that are as identical as possible beforehand, like in the Danish mask RCT that found no effect, researchers risk finding all sorts of spurious correlations and associations. So I totally agree with the authors that “caution is imperative when interpreting the results from this and other observational studies on the relationship between mask wearing and infection risk”.

However, governments worldwide forced people to wear masks on the basis of observational studies far poorer than this one, such as the U.S. CDC’s classic study of two hairstylists.

Originally published by Guy Gin on The Daily Sceptic

All links to previous Gospa News investigations have been added aftermath, for the ties with the topics highlighted 

Subscribe to the Gospa News Newsletter to read the news as soon as it is published


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