Table1.
Zipcode characteristics of low and high air pollution days.
| High pollution day | No (n=21,026,131) | Yes (n=21,026,131) |
|---|---|---|
| Temporal characteristics, n (%) | ||
| Season | ||
| Winter | 5,121,137 (24.4) | 4,865,190 (23.1) |
| Spring | 3,291,420 (15.7) | 3,202,507 (15.2) |
| Summer | 8,067,889 (38.4) | 8,537,690 (40.6) |
| Fall | 4,545,685 (21.6) | 4,420,744 (21.0) |
| SES characteristics, Mean (SD) | ||
| Median house value | 144,016 (130249) | 143,322 (124871) |
| Poverty | 0.11 (0.10) | 0.11 (0.10) |
| Median household income | 46,468 (21477) | 46,172 (20691) |
| Population density | 1,990 (6384) | 2,090 (6222) |
| Percent black | 0.11 (0.19) | 0.11 (0.19) |
| Percent Hispanic | 0.08 (0.15) | 0.08 (0.15) |
| Percent no high school diploma | 0.34 (0.19) | 0.34 (0.19) |
| ZIP code Medicare population | 1,068 (1573) | 1,075 (1579) |
| Environmental exposures, Mean (SD) | ||
| Temperature C° | 16.32 (10.39) | 16.94 (11.12) |
| PM2.5 | 11.10 (3.78) | 23.08 (6.51) |
SES=socioeconomic status; PM2.5= particulate matter<2.5μm