Table 2.
Excessive risk (95% confidence intervals) of outpatient visits of acute lower respiratory infection, pneumonia, and bronchiolitis per interquartile range increment in ambient PM2.5 (daily mean, daily excessive concentration hours [DECH], and hourly peak) at lag03 using single–pollutant and two–pollutant models.
| Pollutants | Models | Excessive risk (95% confidence intervals) | ||
|---|---|---|---|---|
| ALRI | Pneumonia | Bronchiolitis | ||
| PM2.5 daily mean, interquartile range: 23.7 μg/m3 | ||||
| Single–pollutant model | 11.20 (8.34, 14.13) | 15.60 (11.81, 19.52) | 9.50 (6.22, 12.89) | |
| Two–pollutant models | ||||
| Control for SO2 | 9.33 (6.16, 12.59) | 12.99 (8.81, 17.32) | 7.84 (4.19, 11.62) | |
| Control for NO2 | 7.85 (4.50, 11.31) | 12.10 (7.73, 16.65) | 5.56 (1.77, 9.50) | |
| Control for O3 | 12.87 (9.80, 16.02) | 16.96 (12.95, 21.11) | 10.85 (7.38, 14.44) | |
| PM2.5 DECH, interquartile range: 506.5 μg/m3 | ||||
| Single–pollutant model | 12.30 (9.49, 15.18) | 16.32 (12.68, 20.07) | 10.27 (7.09, 13.55) | |
| Two–pollutant models | ||||
| Control for SO2 | 10.47 (7.42, 13.62) | 14.15 (10.14, 18.31) | 8.95 (5.41, 12.61) | |
| Control for NO2 | 9.28 (6.05, 12.61) | 13.48 (9.28, 17.84) | 6.96 (3.30, 10.75) | |
| Control for O3 | 13.57 (10.63, 16.60) | 17.55 (13.74, 21.50) | 11.54 (8.20, 14.99) | |
| PM2.5 hourly peak, interquartile range: 33 μg/m3 | ||||
| Single–pollutant model | 9.73 (6.97, 12.55) | 13.75 (10.11, 17.50) | 8.09 (4.92, 11.36) | |
| Two–pollutant models | ||||
| Con–rol for SO2 | 7.66 (4.64, 10.77) | 10.91 (6.95, 15.02) | 6.17 (2.68, 9.78) | |
| Control for NO2 | 6.02 (2.79, 9.36) | 9.85 (5.67, 14.21) | 3.77 (0.11, 7.56) | |
| Control for O3 | 11.13 (8.18, 14.15) | 14.84 (11.02, 18.80) | 9.18 (5.85, 12.61) | |