Demographics of the study subjects
| Healthy | CF | PCD | |
| Subjects n | 20 | 20 | 17 |
| Males | 9 | 8 | 9 |
| Age years | 13.3±1.89 | 9.9±3.61 | 11.8±3.76 |
| Weight kg | 48.1±12.51 | 31.7±12.89 | 45.5±15.1 |
| Weight z-score# | 0.05±0.90 | −0.33±0.79 | 0.62±1.22 |
| Height cm | 157.9±11.76 | 134.4±19.35 | 147.2±19.37 |
| Height z-score# | 0.19±1.06 | −0.33±0.95 | 0.12±1.15 |
| LCIstandard | 7.10±0.56 | 10.13±2.00¶,+ | 10.12±2.21¶,+ |
Data are presented as mean±sd, unless otherwise stated. CF: cystic fibrosis; PCD: primary ciliary dyskinesia; LCIstandard: lung clearance index calculated according to the current recommendations [9]. #: z-scores calculated according to Centers for Disease Control and Prevention growth charts [30]; ¶: p<0.001, unpaired t-test, compared with healthy subjects; +: p=0.3, unpaired t-test between CF and PCD groups.