We used two different observation periods for the comparative analysis: (1) To assess the effect of the SAH implementation, we included the observation period starting from March 1st to 1 day before the SAH lifting date; and, (2) To assess the effect of the SAH lifting, we included the observation period starting from 1 day after the SAH implementation date to Jul 5th (data cutoff date) of each county. We obtained the dates of implementation and lifting of SAH order at the state level from the “COVID-19 US state policy database” project by Raifman et al. at the Boston University School of Public Health (reviewed on Aug 3rd, 2020) [10]. We assigned the counties within the same state to the same dates of SAH implementation and lifting.

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