Table 4.
Multivariate logistic regression results for the association between secondary attack rate before admission and meteorological factors and air pollution in Hebei Province and Inner Mongolia; People's Republic of China, 2003.
| Affected area | Risk factor | Time variable adjusted OR | 95% CI | P-value |
|---|---|---|---|---|
| Hebei Province | Daily average temperature (DAT) | 1.43 | 0.67, 3.04 | 0.355 |
| Daily average air pressure (DAAP) | 0.48 | 0.21, 1.10 | 0.082 | |
| Daily average relative humidity (DARH) | 1.29 | 0.58, 2.89 | 0.529 | |
| Daily average wind velocity (DAWV) | 0.38 | 0.20, 0.72 | 0.003 | |
| Daily hours of sunshine (DHS) | 1.38 | 0.74, 2.58 | 0.306 | |
| Air pollution index (API) | 0.96 | 0.57, 1.63 | 0.890 | |
| Inner Mongolia | Daily average temperature (DAT) | 1.42 | 0.41, 4.96 | 0.582 |
| Daily average air pressure (DAAP) | 0.49 | 0.15, 1.61 | 0.240 | |
| Daily average relative humidity (DARH) | 0.26 | 0.06, 1.03 | 0.055 | |
| Daily average wind velocity (DAWV) | 0.50 | 0.26, 0.94 | 0.031 | |
| Daily hours of sunshine (DHS) | 0.27 | 0.09, 0.81 | 0.019 | |
| Air pollution index (API) | 0.79 | 0.27, 2.27 | 0.655 |
OR, odds ratio; CI, confidence interval.