| |
All seasons
|
Season
|
|---|
| | |
Cold (October to March)
|
Warm (April to September)
|
|---|
|
Pollutants
|
OR
|
95% CI
|
OR
|
95% CI
|
OR
|
95% CI
|
|---|
|
PM
10
|
1.022
|
1.013-1.031
|
1.018
|
1.008-1.029
|
1.039
|
1.020-1.058
|
|
SO
2
|
1.044
|
1.003-1.086
|
0.983
|
0.908-1.064
|
1.068
|
1.014-1.126
|
|
CO
b
|
1.023
|
1.001-1.047
|
0.991
|
0.965-1.017
|
1.128
|
1.074-1.184
|
|
NO
2
|
1.015
|
1.004-1.026
|
1.000
|
0.984-1.015
|
1.043
|
1.021-1.065
|
-
a Odds ratios were calculated in relation to an increase of 10 μg/m3 of selected air pollutants and were adjusted for meteo-climatic parameters, and influenza epidemic peaks (see Methods - Statistical analysis).
-
b For an increase of 1 mg/m3.
