Characteristics of the 115 children in the study
| Male/female (n) | 69/46 |
| Age in years, mean (range) | 12 (7–17) |
| Children aged 7–9 years, n (%) | 29 (25%) |
| Children aged 10–17 years, n (%) | 86 (75%) |
| Mild intermittent asthma, n (%) | 21 (18%) |
| Mild persistent asthma, n (%) | 44 (38%) |
| Moderate persistent asthma, n (%) | 40 (34%) |
| Severe persistent asthma, n (%) | 10 (9%) |
| FEV1 % predicted, mean±SD | 86±14.9 |
| FEF25–75% % predicted, mean±SD. | 78.7±25.3 |