Subjects n | 978 | 1819 |
Year of questionnaire survey | 1990 | 1998 |
Age years | 2.99 (2.92–3.06) | 3.13 (3.08–3.18) |
Males | 50.6 (495) (47.5–53.8) | 52.7 (958) (50.4–55.0) |
BMI z-scores | −0.693 (−0.143–0.004) | 0.104 (0.052–0.156) |
Current wheeze | 11.9 (116) (9.8–13.9) | 26.3 (478) (24.3–28.3) |
Doctor-diagnosed asthma | 11.0 (108) (9.1–13.0) | 18.6 (339) (16.8–20.4) |
Frequent wheeze# | 6.1 (60) (4.6–7.6) | 13.4 (244) (11.8–15.0) |
Multiple-trigger wheeze¶ | 5.1 (50) (3.7–6.5) | 9.8 (179) (8.5–11.2) |
Hospital admission for wheeze | 3.4 (33) (2.2–4.5) | 6.4 (117) (5.3–7.6) |