Emergency Medical Minute30 Nov 2020

Podcast 617: Masks and Understanding Data

Contributor: Peter Bakes, MD

Educational Pearls:

Recent study looked at if mask wearing protects the mask wearer from infection
This group found 1.8% of mask wearers got COVID while 2.1% of non-mask wearers became infected, which was not statistically significant
This was not statistically significant and has been used to justify not wearing masks by some groups
While the numbers look small, it's close to a 20% reduction in infections for the mask wearers
The results reported had concerns for being underpowered, meaning the studies population may not be big enough to draw definitive conclusions
Many limitations of study including how wearing a mask may protect others
Unfortunately, studies like these can lead to misinterpretation and distortion

References

Bundgaard H, Bundgaard JS, Raaschou-Pedersen DET, von Buchwald C, Todsen T, Norsk JB, Pries-Heje MM, Vissing CR, Nielsen PB, Winsløw UC, Fogh K, Hasselbalch R, Kristensen JH, Ringgaard A, Porsborg Andersen M, Goecke NB, Trebbien R, Skovgaard K, Benfield T, Ullum H, Torp-Pedersen C, Iversen K. Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers : A Randomized Controlled Trial. Ann Intern Med. 2020 Nov 18. doi: 10.7326/M20-6817. Epub ahead of print. PMID: 33205991.

Summarized by Jackson Roos, MS4 | Edited by Erik Verzemnieks, MD

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