Alliance for Pandemic Preparedness

February 8, 2021

The Impact of State Mask-Wearing Requirements on the Growth of COVID-19 Cases in the United States

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An ecological study conducted from January-October 2020 found differences in median COVID-19 case rates (per 100,000) between states who adopted mask requirements “early” (before June 12, 15 states, rate = 5.7), “late” (after June 12, 19 states, rate = 5.59) or “never” (17 states, rate = 5.99). Models that controlled for confounders and interactions between mask requirement status and period showed lower rates in early vs. never adopter states (adjusted ratio of incidence rate ratios [aIRRR]=0.15).

Rebeiro et al. (Feb 7, 2021). The Impact of State Mask-Wearing Requirements on the Growth of COVID-19 Cases in the United States. Clinical Infectious Diseases. https://doi.org/10.1093/cid/ciab101