| Adult CF | Paediatric CF | Controls | |
| Subjects n | 14 | 9 | 9 |
| FEV1 % predicted | 67.6±16.8 (43–98) | 90.1±14.5 (62–106) | 99.2±8.8 (83–113) |
| FVC % predicted | 81.7±18.9 (56–120) | 97.6±8.1 (81–110) | 102.9±6.4 (94–114) |
| FEF25–75% % predicted | 43.3±17.3 (20–70) | 79.8±28.9 (45–134) | 86.7±18.3 (60–117) |
| Age years mean±sd | 23.9±5.5 | 10.7±1.5 | 32.2±15.5 |
Data are presented as mean±sd (range), unless otherwise stated. CF: cystic fibrosis; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; FEF25–75%: forced expiratory flow rate at 25–75% of FVC.