Table 2.
Evolution of pulmonary function testing in BOS patients according to the lung function phenotype
| Mean±s.d. | N (%) | Phenotype 1 a | N (%) | Phenotype 2 b | P-value | N (%) | Total BOS |
|---|---|---|---|---|---|---|---|
| FEV1, L | |||||||
| Diagnosis | 53 | 1.649±0.882 | 24 | 1.922±0.635 | 0.07 | 77 | 1.734±0.819 |
| Last | 46 | 1.849±0.975 | 20 | 2.094±0.864 | 0.24 | 66 | 1.923±0.943 |
| FEV1, % pred | |||||||
| Diagnosis | 53 | 50.9±21.8 | 24 | 61.3±11.5 | 0.01 | 77 | 54.1±19.7 |
| >50% | 25 (47%) | 21 (88%) | |||||
| 30–50% | 20 (38%) | 2 (8%) | |||||
| <30% | 8 (15%) | 1 (4%) | |||||
| Last | 46 | 58.7±26.9 | 20 | 65.5±21.8 | 0.33 | 66 | 60.7±25.5 |
| >50% | 29 (63%) | 16 (80%) | |||||
| 30–50% | 10 (22%) | 2 (10%) | |||||
| <30% | 7 (15%) | 2 (10%) | |||||
| FVC, L | |||||||
| Diagnosis | 53 | 2.811±1.173 | 24 | 2.426±0.822 | 0.26 | 77 | 2.692±1.085 |
| Last | 46 | 2.815±1.113 | 20 | 2.750±1.058 | 0.91 | 66 | 2.796±1.089 |
| FVC, % pred | |||||||
| Diagnosis | 53 | 71.2±22.0 | 24 | 65.6±14.5 | 0.32 | 77 | 69.4±20.0 |
| Last | 46 | 76.9±25.5 | 20 | 72.9±22.3 | 0.60 | 66 | 75.7±24.5 |
| TLC, L | |||||||
| Diagnosis | 47 | 5.737±1.587 | 24 | 4.643±1.309 | 0.008 | 71 | 5.367±1.578 |
| Last | 36 | 5.612±1.861 | 16 | 4.688±1.320 | 0.04 | 52 | 5.327±1.753 |
| TLC, % pred | |||||||
| Diagnosis | 47 | 98.5±21 | 24 | 87.6±15.2 | 0.03 | 71 | 94.8±19.8 |
| Last | 36 | 101.1±26.4 | 16 | 84.9±12.8 | 0.001 | 52 | 96.1±24.1 |
Abbreviations: BOS=bronchiolitis obliterans syndrome; FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity; pred=predicted; TLC=total lung capacity.
aFEV1/FVC ratio <0.7.
bFEV1/FVC ratio >0.7.