Table 4.
Excess risks (ERs) and 95% confidence intervals (CIs) of daily preterm birth in two-pollutant models
| Two-pollutant modelsa | ERs and 95% CIs | |
|---|---|---|
| PM2.5 | – | 4.84 (1.77, 8.00) |
| NO2 | 3.44 (−0.47, 7.50) | |
| SO2 | 3.70 (−0.02, 7.52) | |
| PM10 | – | 3.56 (0.07, 7.17) |
| NO2 | 0.42 (−4.13,5.20) | |
| SO2 | 1.15 (−3.21, 5.69) | |
| SO2 | – | 3.65 (0.86, 6.51) |
| PM2.5 | 1.69 (−1.55, 5.08) | |
| PM10 | 3.09 (−0.41, 6.72) | |
| NO2 | 2.18 (−1.07,5.52) | |
| NO2 | – | 6.49 (1.86, 11.34) |
| PM2.5 | 3.09 (−3.61, 9.11) | |
| PM10 | 6.11 (−0.03,12.62) | |
| SO2 | 4.55 (−0.80, 10.18) |
PM2.5: particulate matter less than 2.5 μm in aerodynamic diameter, PM10: particulate matter less than 10 μm in aerodynamic diameter, SO2: sulfur dioxide, NO2: nitrogen dioxide
aLag day 3 for PM2.5, PM10, NO2, SO2 were used