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. 2022 Apr;112(4):615–623. doi: 10.2105/AJPH.2021.306650

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.