SDI was used to represent mobility at the county level in our study. SDI uses the location data from anonymized mobile devices that are integrated with geographical population data. SDI for each state and county was derived from information such as percentage of people who are staying home, the average number of trips per person and average distance traveled by each person [26]. SDI, ranging from 0 to 100, represented the extent residents/visitors would practice social distancing: “0” indicated no social distancing in the community while “100” indicated all residents were staying at home and no visitors were entering the county. The higher the SDI, the lower the mobility. The mean national county-level SDI was 34.1 on March 7th when SDI data first became available.

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