Relative risks (95% confidence intervals) of first visits to 13 GPs for upper respiratory tract infections (URTI) per 10 μg/m3 increase in the concentrations of air pollutants (2000–2002)
| NO2 | O3 | SO2 | PM10 | *PM2.5 | |
|---|---|---|---|---|---|
| Statistically most significant lag days (either single or cumulative) are shown in curly brackets. | |||||
| *PM2.5 data were available only in the district of GP 9 (Tsuen Wan). GPs 1 and 4 were located in an adjoining district (Kwai Chung). | |||||
| †The RRs for GP 2 were much higher than those of other GPs. The combined RR was recalculated without GP 2 as a sensitivity analysis. | |||||
| GP 1 | 1.026 {0–1}(1.002 to 1.051) | 1.018 {2}(0.992 to 1.045) | 1.032 {0}(1.010 to 1.055) | 1.021 {1}(1.005 to 1.037) | 1.028 {1}(1.002 to 1.056) |
| GP 2 | 1.037 {3}(0.982 to 1.095) | 1.117 {3}(1.008 to 1.238) | 1.173 {2}(1.022 to 1.346) | 1.075 {3}(1.018 to 1.135) | – |
| GP 3 | 1.045 {0–1}(1.028 to 1.062) | 1.035 {1}(1.018 to 1.053) | 0.987 {2}(0.973 to 1.003) | 1.026 {1}(1.017 to 1.036) | – |
| GP 4 | 1.006 {0–1}(0.998 to 1.014) | 1.028 {0–3}(1.001 to 1.056) | 0.988 {0–1}(0.975 to 1.001) | 1.012 {0}(0.998 to 1.026) | 1.017 {0}(1.001 to 1.034) |
| GP 5 | 1.077 {1}(1.021 to 1.135) | 0.949 {0–3}(0.883 to 1.019) | 0.909 {0}(0.756 to 1.093) | 1.047 {0–3}(0.960 to 1.142) | – |
| GP 6 | 1.027 {0}(1.013 to 1.041) | 1.028 {2}(1.013 to 1.044) | 0.977 {2}(0.962 to 0.992) | 1.015 {1}(1.005 to 1.024) | – |
| GP 7 | 1.037 {0–1}(1.020 to 1.055) | 1.017 {1}(0.998 to 1.036) | 0.980 {0–1}(0.959 to 1.002) | 1.022 {0–1}(1.009 to 1.035) | – |
| GP 8 | 1.036 {0}(1.013 to 1.059) | 1.062 {2}(1.036 to 1.089) | 0.976 {2}(0.949 to 1.003) | 1.045 {0–3}(1.015 to 1.076) | – |
| GP 9 | 1.025 {0}(1.009 to 1.041) | 1.027 {1}(1.010 to 1.045) | 1.018 {0}(1.003 to 1.033) | 1.020 {0–3}(1.000 to 1.041) | 1.022 {0}(1.005 to 1.040) |
| GP 10 | 1.073 {0–3}(1.028 to 1.119) | 1.041 {2}(1.017 to 1.065) | 0.958 {0–2}(0.926 to 0.991) | 1.019 {2}(1.001 to 1.037) | – |
| GP 11 | 1.019 {3}(1.005 to 1.033) | 1.014 {2}(1.002 to 1.026) | 1.021 {3}(1.000 to 1.043) | 1.016 {1}(1.001 to 1.031) | – |
| GP 12 | 1.017 {0}(0.987 to 1.049) | 1.027 {2}(0.986 to 1.069) | 1.046 {3}(1.011 to 1.083) | 1.019 {2}(0.997 to 1.041) | – |
| GP 13 | 1.041 {0–3}(0.997 to 1.088) | 0.998 {0–3}(0.994 to 1.003) | 1.010 {0–1}(0.998 to 1.022) | 1.027 {0–3}(1.004 to 1.050) | – |
| Combined RR | 1.030(1.020 to 1.040) | 1.025(1.012 to 1.038) | 1.000(0.987 to 1.013) | 1.020(1.016 to 1.025) | 1.021(1.010 to 1.032) |
| Combined RR after excluding GP 2† | 1.030(1.019 to 1.041) | 1.024(1.011 to 1.036) | 0.999(0.986 to 1.011) | 1.020(1.017 to 1.023) | 1.021(1.010 to 1.032) |