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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