Prevalence % (n) of study characteristics by year of survey
| 1989(N = 871) | 2000*(N = 894) | 2000†(N = 1287) | |
|---|---|---|---|
| BHR, bronchial hyperresponsiveness. | |||
| *2000 data restricted to children in their 12th year. | |||
| †Unrestricted 2000 dataset. | |||
| Body mass index | |||
| Obese | 2.6 (23) | 8.7 (78) | 8.1 (104) |
| Overweight | 11.9 (104) | 22.5 (201) | 21.0 (270) |
| Normal weight | 76.3 (665) | 66.6 (595) | 68.1 (877) |
| Underweight | 9.1 (79) | 2.2 (20) | 2.8 (36) |
| Male sex | 52.1 (454) | 49.7 (444) | 50.2 (645) |
| Mean (range) age (years) | 11.7 (11.1–12.2) | 11.7 (11.1–12.3) | 11.5 (10.1–12.6) |
| Ethnicity | |||
| Maori | 25.8 (225) | 30.8 (275) | 30.6 (394) |
| European | 66.8 (582) | 62.8 (561) | 62.3 (802) |
| Pacific Island | 3.1 (27) | 4.5 (40) | 4.8 (62) |
| Other | 1.0 (9) | 1.5 (13) | 1.6 (20) |
| Missing | 3.2 (28) | 0.5 (5) | 0.7 (9) |
| Wheeze ever | 26.2 (228) | 44.7 (400) | 44.1 (567) |
| Wheeze in last 12 months | 17.7 (154) | 23.3 (208) | 22.0 (283) |
| Wheeze with exercise | 14.8 (129) | 23.8 (213) | 22.8 (293) |
| Asthma ever | 16.9 (147) | 37.0 (331) | 35.7 (460) |
| Hospital admission ever | 8.5 (74) | 13.4 (120) | 14.0 (180) |
| Inhaled steroid or cromoglycate in last 12 months | 5.5 (48) | 16.1 (144) | 15.5 (200) |
| Any medication in last 12 months | 12.7 (111) | 25.2 (225) | 24.3 (313) |
| BHR to exercise | 12.3 (107/868) | 9.0 (80/892) | 8.4 (108/1284) |
| Atopy | – | 37.5 (334/891) | 34.7 (444/1281) |