Table 3.
Indices of exposure to air pollution and incidence of asthmatic episodes a during follow-up in 329 children with recurrent wheezing or asthma b
| |
Asthma episode(s) (n = 159) |
No asthma episodes (n = 170) |
OR (95% CI)
c
|
||
|---|---|---|---|---|---|
| N | % | N | % | ||
|
Proximity to car-traffic |
|
|
|
|
|
| No |
66 |
41.5 |
93 |
54.7 |
1 (reference) |
| Yes |
93 |
58.5 |
77 |
45.3 |
1.79 (1.13-2.84) |
|
Proximity to factories |
|
|
|
|
|
| No |
144 |
90.6 |
150 |
88.2 |
1 (reference) |
| Yes |
15 |
9.4 |
20 |
11.8 |
0.83 (0.40-1.74) |
|
Residence in a green area |
|
|
|
|
|
| No |
73 |
45.9 |
53 |
31.2 |
1 (reference) |
| Yes | 86 | 54.1 | 117 | 68.8 | 0.50 (0.31-0.80) |
aAt least one episode during follow-up; banalyses were based on subjects with available information for at least 9 months of follow-up; codds ratios (OR) adjusted for age, sex, number of siblings, parental education and presence of smokers at home.