Table 3 Relative risk of daily respiratory mortality associated with 10 μg/m3 increase in air pollutant concentration
From: Ambient air pollution and respiratory mortality in Xi’an, China: a time-series analysis
RR(95% CI) | P-value | |
|---|---|---|
Single model | ||
PM2.5 | 1.313 (1.032, 1.708) | 0.024 |
O3 | 1.833 (0.604, 8.633) | 0.437 |
SO2 | 1.4020 (0.827, 2.854) | 0.042 |
After adjusting for collinearity by principal component analysis | ||
PM2.5 | 1.328 (1.033, 1.745) | 0.019 |
O3 | 2.061 (0.630, 10.198) | 0.746 |
SO2 | 1.524 (0.836, 3.406) | 0.015 |