Table 1

COVID-19 cases and deaths in 3141 US counties as of 10 August 2020, by quintiles of Social Vulnerability Index

Social Vulnerability Index
First quintileSecond quintileThird quintileFourth quintileFifth quintile
(Least vulnerable)(Most vulnerable)
COVID-19 cases
 Total cases368 312808 4471 088 6141 614 5751 130 548
 Crude rate per 100 000; median (IQR)474 (279–786)594 (331–1008)670 (372–1272)1009 (485–1849)1816 (1020–2827)
 Adjusted rate ratio (95% CI)1.0 (Ref.)1.24 (1.16 to 1.33)1.39 (1.30 to 1.49)1.76 (1.65 to 1.87)2.11 (1.97 to 2.26)
COVID-19 deaths
 Total deaths13 61128 04334 00747 09338 304
 Crude rate per 100,000; median (IQR)4 (0–15)8 (0–23)10 (0–27)15 (4–41)31 (12–68)
 Adjusted rate ratio (95% CI)1.0 (Ref.)1.19 (1.09 to 1.30)1.22 (1.12 to 1.33)1.77 (1.63 to 1.92)2.42 (2.22 to 2.64)
  • Rate ratios adjusted for US states as a fixed effect (to adjust for state-level confounding factors) in the Poisson regression models using the log of the population as an offset term, and a scale parameter, set as the Pearson χ2 statistic divided by the residual df, to address the issue of potential overdispersion. Data: US Centers for Disease Control and Prevention and USAFacts.

  • CI, confidence interval; df, degrees of freedom; IQR, interquartile range.