Table 1.
Baseline characteristics of the study participants
| Mean ± SD | |
| Number | 23 |
| Age (year) | 64.8 ± 10.6 |
| Men (%) | 11 (47.8%) |
| Body mass index (kg/m2) | 27.7 ± 6.6 |
| FEV1 (L) | 0.84 ± 0.32 |
| FEV1 (% predicted) | 30.8 ± 14.8 |
| PaO2 (mmHg) | 58.6 ± 10.0 |
| PaCO2 (mmHg) | 44.5 ± 9.8 |
| CRQ score | 4.1 ± 1.1 |
| Dyspnea | 3.0 ± 1.0 |
| Fatigue | 3.5 ± 1.3 |
| Emotion | 4.9 ± 1.3 |
| Mastery | 4.5 ± 1.4 |
| Six-minute walk test (m) | 286.0 ± 123.6 |
| SPD (ng/mL)* | 74.7 (49.2–128.7) |
| CC16 (μg/L)* | 4.6 (3.8–8.7) |
| CRP (mg/L)* | 3.5 (1.1–9.8) |
* Median and interquartile range.
Abbreviations: CC16 – Clara cell protein, CRP – C-reactive protein, SPD – Lung surfactant protein D, FEV1 – forced expiratory volume in one second.