Table 4
Odds of a 20% decrement in PEFR below the median by lag in all schools combined for all children and for wheezy children only
| Pollutant | Lag 0 | Lag 1 | Lag 2 | Mean (0–4) |
|---|---|---|---|---|
| Results expressed as odds ratios for unit change of pollutant (95% CI). | ||||
| In addition to pollutant, the individual regression models included the following predictors: 24 hour average outside temperature; date. | ||||
| Mean (0–4) is five day average. | ||||
| NO2 24 h ave. | ||||
| All children | 1.010 (0.991 to 1.030) | 1.018 (0.999 to 1.038) | 1.033 (1.014 to 1.052) | 1.043 (1.000 to 1.089) |
| Wheezy children | 1.015 (0.980 to 1.051) | 1.012 (0.981 to 1.043) | 1.027 (1.000 to 1.054) | 1.053 (0.999 to 1.110) |
| NO2 1 h max. | ||||
| All children | 1.003 (0.993 to 1.013) | 1.000 (0.989 to 1.010) | 1.016 (1.003 to 1.030) | 1.008 (0.975 to 1.043) |
| Wheezy children | 0.996 (0.976 to 1.016) | 1.001 (0.986 to 1.017) | 1.004 (0.982 to 1.026) | 1.004 (0.950 to 1.056) |
| O3 1 h max. | ||||
| All children | 0.988 (0.975 to 1.001) | 0.988 (0.974 to 1.002) | 0.987 (0.975 to 0.998) | 0.976 (0.954 to 0.999) |
| Wheezy children | 0.979 (0.955 to 1.003) | 1.000 (0.980 to 1.022) | 0.983 (0.968 to 0.998) | 0.977 (0.944 to 1.010) |
| O3 8 h mma | ||||
| All children | 0.991 (0.976 to 1.005) | 0.988 (0.972 to 1.002) | 0.981 (0.968 to 0.995) | 0.979 (0.954 to 1.004) |
| Wheezy children | 0.983 (0.959 to 1.007) | 0.994 (0.974 to 1.016) | 0.989 (0.971 to 1.008) | 0.986 (0.949 to 1.023) |
| SO2 24 h ave. | ||||
| All children | 0.987 (0.958 to 1.017) | 1.007 (0.986 to 1.030) | 0.992 (0.963 to 1.023) | 0.972 (0.887 to 1.066) |
| Wheezy children | 0.981 (0.925 to 1.041) | 0.999 (0.957 to 1.042) | 0.995 (0.939 to 1.054) | 1.019 (0.890 to 1.167) |
| SO42− 24 h ave. | ||||
| All children | 1.062 (0.940 to 1.199) | 1.029 (0.921 to 1.149) | 1.038 (0.935 to 1.151) | 1.090 (0.898 to 1.322) |
| Wheezy children | 1.042 (0.854 to 1.271) | 1.059 (0.889 to 1.262) | 0.993 (0.822 to 1.200) | 1.038 (0.754 to 1.429) |
| PM10 24 h ave. | ||||
| All children | 1.012 (0.992 to 1.031) | 1.016 (0.995 to 1.036) | 1.013 (1.000 to 1.025) | 1.037 (0.992 to 1.084) |
| Wheezy children | 1.016 (0.986 to 1.047) | 1.030 (1.001 to 1.060) | 1.018 (0.995 to 1.041) | 1.114 (1.057 to 1.174) |
