Change in prevalence (%) of symptoms
| Symptoms | 1982 % (n = 769) | 1992 % (n = 850) | 1997 % (n = 1016) | Percent increase (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1982–92 | 1992–97 | 1982–97 | |||||||
| Ever wheezed | 23.9 | 36.9 | 42.3 | 13.0 (8.5 to 17.5) | 5.3 (0.1 to 9.8) | 18.4 (14.1 to 22.6) | |||
| Wheezed in the past 12 months | 15.5 | 22.1 | 27.2 | 6.6 (2.8 to 10.4) | 5.1 (1.2 to 9.0) | 11.7 (8.0 to 15.5) | |||
| Four or more wheezing episodes in past 12 months | 5.2 | 13.7 | 16.9 | 8.5 (5.7 to 11.3) | 3.2 (−0.1 to 6.5) | 11.7 (8.8 to 14.5) | |||
| Diagnosed asthma | 12.9 | 30.5 | 38.6 | 17.6 (13.5 to 21.6) | 8.1 (3.8 to 12.4) | 12.9 (10.5 to 15.3) | |||
| Ever had asthma medicine | 8.5 | 35.0 | 46.0 | 26.5 (22.8 to 30.3) | 10.9 (6.4 to 15.4) | 8.5 (6.5 to 10.5) | |||
| Has ever had hay fever or nasal allergies | 22.5 | 43.7 | 44.0 | 21.2 (16.6 to 25.8) | −0.3 (−4.3 to 4.8) | 21.5 (17.2 to 25.7) | |||
| Natural mother or father has had asthma | 25.0 | 30.8 | 41.9 | 5.8 (1.3 to 10.2) | 11.1 (6.6 to 15.7) | 16.9 (12.4 to 21.4) | |||