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. 2021 Oct 1;70(39):1377–1378. doi: 10.15585/mmwr.mm7039e3

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This figure is a bar chart showing the mean daily county-level change in COVID-19 cases per 100,000 children and adolescents aged <18 years in 520 U.S. counties with and without school mask requirements during July 1–September 4, 2021. — Mean county-level change in daily number of COVID-19 cases per 100,000 children and adolescents aged <18 years in counties (N = 520) with and without school mask requirements* before and after the start of the 2021–22 school year — United States, July 1–September 4, 2021

* Among 520 counties, 198 (38%) had a school mask requirement and 322 (62%) did not have a school mask requirement.