Independent variables | Sex | Skin-prick test | Total¶ | ||
Females# | Males# | Positive¶ | Negative¶ | ||
Positive skin-prick test | 1.1 (0.6–1.8) | 1.7 (0.8–3.5) | 1.2 (0.8–1.9) | ||
Family history of asthma | 1.6 (1.0–2.6) | 4.2 (2.0–8.9) | 2.9 (1.4–6.0) | 1.9 (1.2–3.0) | 2.0 (1.4–3.0) |
Hay fever | 4.6 (2.5–8.4) | 5.4 (2.3–12.7) | 4.1 (2.2–7.8) | 6.3 (2.8–14.5) | 4.8 (3.0–7.8) |
Eczema | 1.5 (0.9–2.3) | 0.7 (0.3–1.5) | 1.2 (0.6–2.4) | 1.3 (0.8–2.1) | 1.2 (0.8–1.8) |
Smoking habit | |||||
Nonsmoker | 1 | 1 | 1 | 1 | 1 |
Ex-smoker | 1.7 (1.0–2.9) | 1.6 (0.7–3.5) | 1.9 (0.8–4.2) | 1.5 (0.9–2.5) | 1.6 (1.1–2.5) |
Smoker | 0.8 (0.5–1.4) | 1.3 (0.5–3.1) | 1.4 (0.6–3.0) | 0.7 (0.4–1.2) | 0.9 (0.6–1.4) |
BMI | |||||
<20 | 1.0 (0.5–1.9) | 2.3 (0.3–16.5) | 1.2 (0.4–3.6) | 1.0 (0.4–2.2) | 1.0 (0.5–1.9) |
20–24.9 | 1 | 1 | 1 | 1 | 1 |
25–29.9 | 1.8 (1.1–3.2) | 2.6 (1.2–5.5) | 2.9 (1.3–6.4) | 1.8 (1.1–3.1) | 2.0 (1.3–3.1) |
≥30 | 3.0 (1.4–6.1) | 3.3 (1.2–9.3) | 5.0 (1.4–17.3) | 2.1 (1.1–4.2) | 2.7 (1.5–4.7) |
Data are presented as odds ratio (95% confidence interval). BMI: body mass index (kg·m−2). #: adjusted for area and age; ¶: adjusted for area, age and sex.