Spirometry data for each group
| No asthma (n=180) | Asthma normal spirometry (n=126) | Asthma obstructed spirometry (n=51) | |
| FVC % pred | 92±15 | 88±14 | 84.3±17.0 |
| FEV1 % pred | 90±14 | 86±13 | 67.4±14.5 |
| FEV1/FVC % | 82±4 | 81±4 | 66±5 |
Data are presented as mean ±sd. FVC: forced vital capacity; FEV1: forced expiratory volume in 1 s; % pred: % predicted.