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. 2021 Feb 10;49(8):1036–1042. doi: 10.1016/j.ajic.2021.02.002

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© 2021 Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig 3 — Rate Ratios, Adjusted for Percent in State Age 65 or Over, Comparing COVID-19 Rates Based on Different Lengths of Time to Mask Mandates at Day 262. *All rate ratios adjusted for percent in state age 65 or over.