Table 4.
Association between ambient PM2.5 and overall SDNN.
| PM2.5 integration period | IQR (μ g/m3) | Percent change | 95% CI |
|---|---|---|---|
| 1 hr | 10.3 | 1.50 | –2.22 to 5.36 |
| MI only | 9.74 | –2.75 | –7.93 to 2.72 |
| COPD only | 10.66 | 5.07* | 0.01 to 10.38* |
| 4 hr | 10.63 | 1.97 | –2.30 to 6.43 |
| MI only | 8.54 | –2.89 | –7.79 to 2.27 |
| COPD only | 11.65 | 8.29* | 1.71 to 15.30* |
| 24 hr | 8.00 | –1.00 | –4.67 to 2.82 |
| MI only | 8.05 | –4.38 | –9.42 to 0.94 |
| COPD only | 7.84 | 1.58 | –3.59 to 7.01 |
Percent change in overall SDNN (with 95% CIs) expressed per IQR change in ambient PM2.5. Model does not include heart rate.
*
Statistically significant estimate.