Adjusted odds ratios (OR) and 95% confidence intervals (95%CI) for low birth weight according to quartiles of air pollution in each trimester of pregnancy, São Paulo, 1997
| First trimester | Second trimester | Third trimester | |||||
|---|---|---|---|---|---|---|---|
| Quartile | OR | 95%CI | OR | 95%CI | OR | 95%CI | |
| PM10 | 1st | 1 | 1 | 1 | |||
| 2nd | 1.105 | (0.994 to 1.229) | 1.003 | (0.904 to 1.113) | 1.004 | (0.914 to 1.104) | |
| 3rd | 1.049 | (0.903 to 1.219) | 1.074 | (0.920 to 1.254) | 1.003 | (0.861 to 1.169) | |
| 4th | 1.144 | (0.878 to 1.491) | 1.252 | (1.028 to 1.525) | 0.970 | (0.780 to 1.205) | |
| CO | 1st | 1 | 1 | 1 | |||
| 2nd | 1.118 | (0.964 to 1.296) | 1.032 | (0.889 to 1.184) | 0.979 | (0.863 to 1.112) | |
| 3rd | 1.069 | (0.905 to 1.262) | 0.978 | (0.836 to 1.144) | 0.990 | (0.853 to 1.150) | |
| 4th | 1.022 | (0.822 to 1.270) | 1.075 | (0.888 to 1.300) | 0.931 | (0.769 to 1.128) | |
| SO2 | 1st | 1 | 1 | 1 | |||
| 2nd | 0.902 | (0.843 to 0.966) | 0.986 | (0.922 to 1.053) | 1.203 | (0.861 to 1.680) | |
| 3rd | 0.911 | (0.819 to 1.013) | 1.005 | (0.904 to 1.117) | 1.225 | (0.872 to 1.722) | |
| 4th | 0.906 | (0.793 to 1.036) | 1.017 | (0.883 to 1.173) | 1.145 | (0.749 to 1.752) | |
| NO2 | 1st | 1 | 1 | 1 | |||
| 2nd | 1.060 | (0.971 to 1.157) | 0.986 | (0.902 to 1.076) | 0.992 | (0.913 to 1.078) | |
| 3rd | 1.197 | (0.885 to 1.619) | 1.008 | (0.871 to 1.167) | 1.041 | (0.927 to 1.169) | |
| 4th | 1.126 | (0.812 to 1.560) | 1.034 | (0.861 to 1.243) | 1.046 | (0.889 to 1.231) | |
| O3 | 1st | 1 | 1 | 1 | |||
| 2nd | 0.934 | (0.841 to 1.039) | 1.094 | (0.969 to 1.236) | 0.877 | (0.775 to 0.992) | |
| 3rd | 1.009 | (0.890 to 1.144) | 1.099 | (0.945 to 1.278) | 0.991 | (0.859 to 1.144) | |
| 4th | 0.962 | (0.831 to 1.114) | 1.116 | (0.939 to 1.326) | 0.976 | (0.826 to 1.153) | |