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. 2020 May 4;12:313–325. doi: 10.2147/IJWH.S227049

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.