Characteristics of participants in the cross sectional and prospective studies
| Cross sectional study | |
| No of participants | 220 |
| Mean (SD) age (years) | 14.5 (10.6) |
| Median (range) age (years) | 11.8 (0.7–65.4) |
| Age <18 years, n (%) | 168 (76%) |
| Male, n (%) | 110 (50%) |
| P aeruginosa colonisation status, n (%) | |
| Chronic | 67 (31%) |
| Intermittent | 60 (27%) |
| No colonisation | 93 (42%) |
| Prospective study | |
| Number of participants | 57 |
| Mean (SD) age (years) | 8.1 (2.8) |
| Median (range) age (years) | 7.9 (4.3–14.2) |
| Male, n (%) | 30 (53%) |
| P aeruginosa colonisation status, n (%) | |
| Chronic | 13 (23%) |
| Intermittent | 13 (23%) |
| No colonisation | 31 (54%) |