Table 2.

Associations Between Tract-Level Social and Demographic Variables and Baseline Levels and Time Trends in Ozone Concentrations, North Carolina, 2002–2016^a

Variable b	Main Effect		Interaction With Time
	Posterior Median	95% CrI	Posterior Median	95% CrI
RI of non-Hispanic Black individuals	−0.065	−0.15, 0.019	−0.63c	−0.78, −0.47
EI of non–college educated individuals	0.023	−0.077, 0.12	0.54c	0.35, 0.73
Percentage of population in urban settings	0.38c	0.30, 0.47	0.084	−0.079, 0.25
NDI	−0.061c	−0.11, −0.017	0.078	−0.0080, 0.17

Abbreviations: CrI, credible interval; EI, educational isolation; NDI, Neighborhood Deprivation Index; RI, racial isolation.

^a Models adjusted for all community-level characteristics (i.e., RI, EI, urbanicity, and NDI); separate models were not fitted for each community-level characteristic. Values are shown to 2 significant digits.

^b Correlations between demographic variables ranged from −0.46 (between EI and urbanicity) to 0.58 (between EI and NDI); ranges of variable values and correlations between all variables are provided in Web Tables 1–2.

^c Coefficients for which the 95% CrI does not include zero.