TABLE 2—
Association of County-Level Factors and COVID-19 (December 2020‒March 2022) or Influenza (2021) Vaccination: Indiana
| Variable | COVID-19 (Forward/Stepwise) | Influenza (Backward) | ||
| b (95% CI) | Effect Size | b (95% CI) | Effect Size | |
| Total primary care providers per 100 000 individuals | 0.04 (0.02, 0.05) | 0.040 | … | … |
| Median household income (thousands) | 0.23 (0.12, 0.34) | 0.027 | … | … |
| % of Medicare enrollees with mammography screening | 0.29 (0.08, 0.51) | 0.011 | … | … |
| % of all county residents | ||||
| Uninsured | −1.22 (−1.57, −0.87) | 0.071 | 0.71 (0.22, 1.21) | 0.027 |
| African American | 0.31 (0.19, 0.42) | 0.041 | −0.07 (−0.13, −0.01) | 0.016 |
| Female | −0.97 (−1.79, −0.15) | 0.008 | … | … |
| Hispanic | … | … | −0.28 (−0.40, −0.17) | 0.079 |
| % of adult county residents | ||||
| Smoke | −0.75 (−1.26, −0.23) | 0.012 | −0.85 (−1.06, −0.64) | 0.216 |
| Completed high school | … | … | 0.54 (0.21, 0.87) | 0.035 |
| Adjusted R2 | 0.867 | 0.702 | ||
Note. CI = confidence interval. This table shows multiple linear regression results—selected reduced models.