9/n The study also DOESN'T show that WEARING A MASK is ineffective. It showed that PROVIDING MASKS AND TELLING PEOPLE TO WEAR THEM was ineffective ON TOP OF SOCIAL DISTANCING
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A good thread, except that you want/expect the study to prove something it never intended to do. The question is about recommending or mandating masks in the battle with covid-19. The answer is that the differences are negligible
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The big headache for any community study where the prevalence is low is getting recruitment. The variance and statistical noise make it extremely difficult to achieve statistical significance, even with PPE in a clinical setting.
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Correct, a statistically significant difference was not found by this study. Variation between the groups is not different than what would be expected due to randomness. There is no reason to speculate a larger study would yield a different conclusion.
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So what's the conclusion here? That the study found a 25% risk reduction if people were told to wear masks, and that the study was too small for that result to be statistically significant?
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I think that's a reasonable conclusion - and also needs to be clear that they were only studying risk to the wearer. To be more dispassionate, and based on their powering: "the study found no evidence of a greater than 50% risk reduction to the wearer when advised to wear masks"
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@threadreaderapp unroll please -
Bonjour, you can read it here:
@GidMK: So, The Big Mask study has been published, and I thought rather than expound on what the results DID show… https://threadreaderapp.com/thread/1329171522485772288.html … Talk to you soon.
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@threadreaderapp unroll please -
Hello, here is your unroll:
@GidMK: So, The Big Mask study has been published, and I thought rather than expound on what the results DID show… https://threadreaderapp.com/thread/1329171522485772288.html … Share this if you think it's interesting.
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Does this study primarily present evidence of how masks protect the wearer, but does not provide evidence of how the mask protects others FROM the wearer? My ongoing understanding has been that masks' primary utility is to protect others. This seems under-discussed
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1. It is not ethical to make trials where healthy people are exposed to risks of disease from sick people. 2. It's not possible to protect against non-existing risks. Healthy people don't transmit disease to others even though governments say they do.https://www.youtube.com/watch?v=NQTBlbx1Xjs …
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