Age, sex, and past history
| Male:female ratio | 28:37 (54% female) |
| Age at diagnosis | Median 5.2 years (range 0.5–15 years) |
| Age at onset of cough | Median 2.3 years (range 0–14 years) |
| Duration of symptoms | Median 1.0 years (range 6 weeks to 14 years) |
| Age first (non-bronchiectasis) respiratory hospitalisation (74%) | Median 1.0 years (range 1 month to 13 years) |
| 29% bronchopneumonia | |
| 33% lobar pneumonia | |
| 38% bronchiolitis |