Table 2.
Descriptive statistics for the ecological covariates.
| Correlation with mean PM2.5 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Percentile | ||||||||||||
| Variable | Minimum | 5th | 25th | 50th | 75th | 95th | Maximum | |||||
| Summarized by census tract | ||||||||||||
| Percent adults without a high school diploma | 0.0 | 17.2 | 28.8 | 37.6 | 45.7 | 57.1 | 100 | –0.09 | ||||
| Percent individuals in the lowest income quintile | 0.0 | 6.8 | 12.5 | 18.0 | 24.7 | 39.5 | 100 | –0.03 | ||||
| Percent unemployed adults | 0.0 | 4.3 | 6.3 | 8.0 | 10.0 | 14.5 | 66.7 | –0.12 | ||||
| Summarized by census division | ||||||||||||
| Percent adults without a high school diploma | 23.7 | 27.2 | 32.0 | 36.3 | 41.8 | 53.3 | 72.9 | –0.13 | ||||
| Percent individuals in the lowest income quintile | 5.9 | 11.6 | 17.8 | 20.6 | 21.7 | 26.8 | 45.3 | –0.06 | ||||
| Percent unemployed adults | 2.9 | 5.9 | 7.4 | 8.1 | 9.2 | 13.2 | 26.8 | –0.15 | ||||