Table 1.
Prevalence (%) and odds ratios (95% CI) of asthma-like symptoms by video questionnaire; reports according to tobacco consumption groups
| Persistent smokers % OR (95% CI) | Ex-smokers % OR (95% CI) | Nonsmokers % OR (95% CI) | |
|---|---|---|---|
| Wheezing ever | 33.9
1.4 (1.2–1.7)* |
28.1
1.1 (0.9–1.3) |
26.3
1 |
| Wheezing in the last 12 m | 22.7
1.5 (1.3–1.9)* |
17.0
1.1 (0.9–1.3) |
16
1 |
| Wheezing with exercise, ever | 36.7
1.4 (1.1–1.6)* |
28.2
0.9 (0.8–1.1) |
29.9
1 |
| Wheezing with exercise in the last 12 m | 28.9
1.5 (1.3–1.9)* |
20.8
1.0 (0.9–1.3) |
20.9
1 |
| Wheezing during night, ever | 11.1
1.4 (1.1–1.8)† |
9.7
1.2 (0.9–1.5) |
8.3
1 |
| Wheezing during night in the last 12 m | 6.7
1.2 (0.9–1.7) |
5.6
1.0 (0.8–1.3) |
5.6
1 |
| Cough ever | 46.2
1.9 (1.6–2.3)* |
32.8
1.1 (0.9–1.3) |
30.8
1 |
| Cough, in last 12 m | 34.2
1.9 (1.6–2.3)* |
23.3
1.1 (0.9–1.3) |
21.3
1 |
| Severe asthma crisis, ever | 12.0
1.3 (0.9–1.7) |
10.3
1.1 (0.8–1.3) |
9.6
1 |
| Severe asthma crisis, in the last 12 m | 7.6
1.5 (1.1–2.1)‡ |
6.5
1.3 (0.9–1.7) |
5.2
1 |
Notes: *p < 0.001;
†
p ≤ 0.01;
‡
p < 0.05; Persistent smokers (n = 768), ex-smokers (n = 1841), and nonsmokers (n = 2129).
Abbreviations: CI, confidence interval; OR, odds ratio.