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. 2021 Mar 24;16(3):e0248702. doi: 10.1371/journal.pone.0248702

Table 1. Data sources.

County-Level Variable Year Source
COVID-19 cases 2020 Johns Hopkins Center for Systems Science and Engineering [27]; USAFacts [26]
COVID-19 deaths 2020 Johns Hopkins Center for Systems Science and Engineering [20]; USAFacts [26]
Daily PCR Testing 2020 US Department of Health and Human Services
Social Vulnerability Index 2018 Centers for Disease Control and Prevention [30]
Population Size 2019 Centers for Disease Control and Prevention [31]
Population Density 2018–2019 Centers for Disease Control and Prevention [30]
Race 2019 US Census Bureau [29]
Ethnicity 2019 US Census Bureau [29]
Gender 2019 US Census Bureau [29]
Age 2019 US Census Bureau [29]
Rurality 2019 Robert Wood Johnson Foundation [32]
Poverty 2018–2019 Robert Wood Johnson Foundation [32]
Primary Care Physicians 2020 Robert Wood Johnson Foundation [32]
Smoking 2020 Robert Wood Johnson Foundation [32]
Poor or Fair Health 2020 Robert Wood Johnson Foundation [32]
Temperature 2020 National Oceanic and Atmospheric Administration [33]
Precipitation 2020 National Oceanic and Atmospheric Administration [33]
PM2.5 2019 Robert Wood Johnson Foundation [32]