Table 3.
The Results of the Modified GAM of the Relationship Between Air Pollutants and Preterm Labor of Ahvaz (Increasing the Cases of Daily Low Birth Weight per Increasing 10 Units in a Daily Average of the Pollutant)
Lag | Pollutant | edf | Risk Ratio | 95% CI | P-value* |
---|---|---|---|---|---|
Lag 0 | O3 | 8.887 | 0.996 | 0.994–0.999 | 0.004† |
NO2 | 8.643 | 1.031 | 1.025–1.037 | <0.001† | |
NO | 6.196 | 1.055 | 1.049–1.061 | <0.001† | |
SO2 | 4.827 | 0.966 | 0.958–0.973 | <0.001† | |
CO | 8.679 | 1.457 | 1.369–1.551 | <0.001† | |
PM10 | 7.605 | 1.000 | 0.999–1.001 | 0.971 | |
PM2.5 | 7.109 | 1.004 | 1.003–1.005 | <0.001† | |
Lag 1 | O3 | 8.790 | 0.996 | 0.993–0.999 | 0.004† |
NO2 | 6.338 | 1.031 | 1.025–1.037 | <0.001† | |
NO | 8.703 | 1.055 | 1.049–1.061 | <0.001† | |
SO2 | 4.138 | 0.962 | 0.954–0.969 | <0.001† | |
CO | 8.051 | 1.448 | 1.358–1.544 | <0.001† | |
PM10 | 8.716 | 1.000 | 0.999–1.001 | 0.381 | |
PM2.5 | 8.477 | 1.004 | 1.003–1.005 | <0.001† | |
Lag 2 | O3 | 8.880 | 0.994 | 0.991–0.997 | <0.001† |
NO2 | 8.592 | 1.037 | 1.031–1.043 | <0.001† | |
No | 7.224 | 1.056 | 1.051–1.062 | <0.001† | |
SO2 | 8.259 | 0.962 | 0.955–0.970 | <0.001† | |
CO | 8.799 | 1.451 | 1.365–1.542 | <0.001† | |
PM10 | 7.124 | 0.999 | 0.997–1.000 | 0.006† | |
PM2.5 | 8.375 | 1.004 | 1.003–1.005 | <0.001† | |
Lag 3 | O3 | 8.873 | 0.997 | 0.995–1.000 | 0.022† |
NO2 | 7.969 | 1.037 | 1.031–1.043 | <0.001† | |
NO | 6.001 | 1.057 | 1.051–1.062 | <0.001† | |
SO2 | 5.211 | 0.959 | 0.952–0.967 | <0.001† | |
CO | 8.491 | 1.471 | 1.387–1.560 | <0.001† | |
PM10 | 7.394 | 0.999 | 0.998–1.000 | 0.022† | |
PM2.5 | 8.739 | 1.004 | 1.003–1.005 | <0.001† | |
Lag4 | O3 | 8.803 | 0.997 | 0.995–1.000 | 0.021† |
NO2 | 7.333 | 1.039 | 1.033–1.045 | <0.001† | |
NO | 8.738 | 1.057 | 1.051–1.062 | <0.001† | |
SO2 | 4.224 | 0.963 | 0.956–0.971 | <0.001† | |
CO | 8.357 | 1.472 | 1.388–1.562 | <0.001† | |
PM10 | 8.059 | 0.998 | 0.997–0.999 | <0.001† | |
PM2.5 | 8.862 | 1.003 | 1.002–1.005 | <0.001† | |
Lag 5 | O3 | 8.766 | 0.995 | 0.992–0.998 | <0.001† |
NO2 | 7.987 | 1.039 | 1.033–1.045 | <0.001† | |
NO | 8.562 | 1.057 | 1.052–1.063 | <0.001† | |
SO2 | 4.968 | 0.959 | 0.952–0.967 | <0.001† | |
CO | 8.366 | 1.455 | 1.369–1.546 | <0.001† | |
PM10 | 6.915 | 0.997 | 0.996–0.998 | <0.001† | |
PM2.5 | 6.536 | 1.003 | 1.001–1.004 | <0.001† | |
Lag 6 | O3 | 8.856 | 0.995 | 0.992–0.998 | <0.001† |
NO2 | 6.366 | 1.038 | 1.032–1.044 | <0.001† | |
NO | 7.450 | 1.057 | 1.051–1.062 | <0.001† | |
SO2 | 3.975 | 0.959 | 0.951–0.966 | <0.001† | |
CO | 8.304 | 1.492 | 1.404–1.585 | <0.001† | |
PM10 | 8.193 | 0.998 | 0.997–0.999 | <0.001† | |
PM2.5 | 8.744 | 1.004 | 1.002–1.005 | <0.001† |
Notes: †Statistically significant. *Adjusted for trend, seasonality, temperature, relative humidity and weekdays.