Table 1 Demographic characteristics of the study population at baseline in 1993, by smoking group
From: Incidence of new-onset wheeze: a prospective study in a large middle-aged general population
Smokers | Ex-smokers | Never-smokers | Alla | |
|---|---|---|---|---|
Age, years (SD) | 37.0 (8.8) | 39.9 (7.5) | 34.3 (9.1) | 36.1 (9.0) |
All | 24.8 %b (n = 2202) | 20 %b (n = 1777) | 50.8 %b (n = 4509) | 100 % (n = 8885) |
Female gender | 58.1 % (n = 1279) | 49.6 % (n = 881) | 51.2 % (n = 2308) | 52.5 % (n = 4665) |
Atopy | 13.1 % (n = 288) | 16.9 % (n = 301) | 18.5 % (n = 836) | 16.8 % (n = 1490) |
Rhinitis | 23.3 % (n = 513) | 27.7 % (n = 493) | 22.6 % (n = 1021) | 23.9 % (n = 2121) |
Chronic bronchitis | 0.6 % (n = 13) | 0.7 % (n = 12) | 0.6 % (n = 25) | 0.6 % (n = 52) |
BMI ≥30 (2003) | 10.2 % (n = 224) | 11.4 % (n = 202) | 8.8 % (n = 395) | 9.7 % (n = 858) |
20-30 years old | 27.4 % (n = 603) | 13.8 % (n = 246) | 40.3 % (n = 1815) | 31.8 % (n = 2829) |
31-40 years old | 32.2 % (n = 709) | 32.4 % (n = 575) | 29.6 % (n = 1335) | 30.7 % (n = 2723) |
41-50 years old | 40.4 % (n = 890) | 53.8 % (n = 956) | 30.1 % (n = 1359) | 37.5 % (n = 3333) |