Community Use Of Face Masks And COVID-19: Evidence From A Natural Experiment Of State Mandates In The US
Community Use Of Face Masks And COVID-19: Evidence From A Natural Experiment Of State Mandates In The US
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DOI：
10.1377/hlthaff.2020.00818
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发表时间：
2020-08-01
期刊：
影响因子：
9.7
通讯作者：
Wehby, George L.
中科院分区：
文献类型：
--
作者：
Lyu, Wei;Wehby, George L.
国家政策规定公众或社区使用口罩或防护罩以减缓2019冠状病毒病（COVID-19）的传播，这一规定引发了激烈的争议。这项研究提供了一项自然实验的证据，该实验是关于15个州加上华盛顿，华盛顿特区发布的州政府在公共场合使用口罩的规定的影响，2020年4月8日至5月15日。研究设计是一项事件研究，研究2020年3月31日至5月22日期间县级COVID-19每日增长率的变化。强制在公共场所使用口罩与COVID-19日增长率在国家口罩订单签署后1-5天、6-10天、11- 1 - 5天、16-20天和21天或更长时间内分别下降0. 9、1. 1、1. 4、1. 7和2. 0个百分点有关。估计表明，由于这些任务的执行，截至2020年5月22日，避免了超过200，000例COVID-19病例。研究结果表明，要求在公共场所使用口罩可能有助于减缓COVID-19的传播。
State policies mandating public or community use of face masks or covers in mitigating the spread of coronavirus disease 2019 (COVID-19) are hotly contested. This study provides evidence from a natural experiment on the effects of state government mandates for face mask use in public issued by fifteen states plus Washington, D.C., between April 8 and May 15, 2020. The research design is an event study examining changes in the daily county-level COVID-19 growth rates between March 31 and May 22, 2020. Mandating face mask use in public is associated with a decline in the daily COVID-19 growth rate by 0.9, 1.1, 1.4, 1.7, and 2.0 percentage points in 1-5, 6-10, 11-15, 16-20, and 21 or more days after state face mask orders were signed, respectively. Estimates suggest that as a result of the implementation of these mandates, more than 200,000 COVID-19 cases were averted by May 22, 2020. The findings suggest that requiring face mask use in public could help in mitigating the spread of COVID-19.