Table 6.
Association between 4-hr EC, NO2, and O3 concentrations and overall SDNN.
| Pollutant | IQR | Percent change | 95% CI |
|---|---|---|---|
| EC | 1.68 | –0.83 | –3.27 to 1.67 |
| MI only | 1.39 | –1.06 | –4.19 to 2.16 |
| COPD only | 1.92 | 0.51 | –3.33 to 4.51 |
| NO2 | 10.66 | –0.49 | –5.4 to 4.6 |
| MI only | 9.25 | –12.09* | –19.5 to –4.0 |
| COPD only | 11.97 | 7.70* | 0.1 to 15.9 |
| O3 | 9.61 | 0.75 | –3.6 to 5.3 |
| MI only | 8.08 | 0.13 | –6.5 to 7.2 |
| COPD only | 10.66 | 2.45 | –3.4 to 8.7 |
Data are percent change in overall SDNN (with 95% CIs) expressed per IQR change in pollutant concentrations. Units for IQR are μ g/m3 for EC, and ppb for O3 and NO2. Model does not include heart rate.
*
Statistically significant estimate.