Clinical characteristics of patients with cystic fibrosis
| Number of subjects | 60 |
| Male (%) | 34 (57) |
| Median (range) age (years) | 27.8 (17.6–40.2) |
| Median (range) FEV1 (% predicted) | 39.4 (12–117) |
| Median (range) no. exacerbations in previous year | 3 (0–8) |
| Median (range) sputum samples per patient | 3 (1–15) |
| Median (range) duration of study (months) | 6.9 (1.5–11.0) |