Table 7.
Association of SDNN and ambient 4-hr concentrations: baseline FEV1 (percent predicted) as an effect modifier.
| Pollutant | FEV1 | Percent change | 95% CIa |
|---|---|---|---|
| PM2.5 (10.6 μ g/m3) | 105 | –2.5 | –7.8 to 3.2 |
| 35 | 10.2* | 3.8 to 17.0 | |
| EC (1.7 μ g/m3) | 105 | –3.9* | –7.4 to –0.3 |
| 35 | 2.5 | –1.3 to 6.4 | |
| NO2 (10.7 ppb) | 105 | –5.4 | –12.0 to 1.8 |
| 35 | 5.7 | –1.2 to 12.9 | |
| O3 (9.6 ppb) | 105 | –0.4 | –7.1 to 6.8 |
| 35 | 1.1 | –4.1 to 6.6 |
a
Expressed as a change per IQR for the 4-hr mean ambient concentration.
*
Statistically significant association.