TABLE 2—
Mean Difference in Modeled and Measured PM2.5 Concentrations (μg/m3) in American Indian (AI)-Populated vs Non–AI-Populated Counties: United States, 2000–2018
| Model 1,a Mean Difference (95% CI) | Model 2,b Mean Difference (95% CI) | Model 3,c Mean Difference (95% CI) | |
| Modeled PM2.5 | −0.56 (−0.74, −0.38) | −0.36 (−0.52, −0.21) | −0.38 (−0.54, −0.23) |
| Measured PM2.5 | −1.65 (−2.18, −1.13) | −0.70 (−1.17, −0.22) | −0.79 (−1.26, −0.33) |
Note. CI = confidence interval; PM2.5 = fine particulate matter.
aAdjusted only for year and random intercepts for counties in states.
bAdditionally adjusted for population density.
cAdditionally adjusted for population density and median household income.