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Based on the evidence that nonmedical face masks prevent the spread of severe acute respiratory syndrome coronavirus 2,1,2 many governments are mandating the wearing of masks in the community. However, fueled partly by claims on social media that masks can cause hypoxia and are therefore dangerous,3 concerns have emerged about the safety of wearing face masks. We examined whether wearing nonmedical face masks was associated with a change in oxygen saturation.
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Corresponding Author: Noel C. Chan, MBBS, C5-116 DBCVRI, 237 Barton St E, Hamilton, ON L8L 2X2, Canada (firstname.lastname@example.org).
Published Online: October 30, 2020. doi:10.1001/jama.2020.21905
Author Contributions: Dr Chan had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Concept and design: Chan, Hirsh.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Chan, Hirsh.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Chan, Li.
Administrative, technical, or material support: Chan, Li.
Supervision: Chan, Hirsh.
Conflict of Interest Disclosures: Dr Chan reports receiving a speaker’s fee from Bayer outside of the submitted work. No other disclosures were reported.
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