Table 6

 Key second trimester findings of multivariate linear regression analysis (multiple linear regression coefficients (SE)) using multi-pollutant models and controlling for pollutant exposures in other pregnancy periods for babies born to women residing within 5 km of an air monitoring station; birth weight is expressed in grams

Single pollutant model95% confidence limitsTwo pollutant models (PM10 and CO)95% confidence limitsTwo pollutant models (PM10 and NO2)95% confidence limitsTwo pollutant models (CO and NO2)95% confidence limitsTwo pollutant models (PM10 and O3)95% confidence limitsFour pollutant model95% confidence limitsControlling for exposures in other pregnancy periods95% confidence limits
ppb, parts per billion (10−9); ppm, parts per million (10−6)
Units and averaging periods:
PM10 (μg/m3), 24 hour av
CO (ppm), 8 hour av
NO2 (ppb), 1 hour max
PM10−4.28−5.79−2.77−3.72−6.29−1.15−2.65−4.32−0.98−5.47−7.06−3.88−3.27−7.050.51−3.03−4.85−1.21
NO2−33.85−43.38−24.32−26.21−37.46−14.96−26.74−45.75−7.73−9.91−35.1015.28−25.26−35.63−14.89
CO−28.87−50.98−6.76−27.31−55.300.68−20.17−43.122.78−25.97−54.152.21−24.38−47.33−1.43
O38.771.0516.4918.2810.0326.53−14.81−33.654.038.841.1016.58