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. 2023 Jan 19. Online ahead of print. doi: 10.1016/j.annemergmed.2022.12.004

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Total boarding hours and LWBS or SAL per month, with monthly incidence of COVID-19 per 100,000 people. Box-and-whisker plots show, for each month, median (horizontal bar), IQR (box), 1.5∗IQR (whisker), and outliers (points). Red points indicate unadjusted monthly mean. The number of participating EDs/hospitals varies over time; 43 EDs are included from January 2019 to August 2020, 40 EDs are included from September 2020 to February 2021, 39 EDs are included from March 2021 to June 2021, and 38 EDs are included from July 2021 to December 2021.