General and lung function data
| Controls (n=14) | COPD (n=23) | p value | |
|---|---|---|---|
| BMI=body mass index; FEV1=forced expiratory volume in 1 second; TLC=total lung capacity; RV=residual volume; Pao2=arterial oxygen tension; Paco2=arterial CO2 tension; NS=non-significant. | |||
| Age (years) | 62 (12) | 66 (6) | NS |
| BMI (kg/m2) | 27 (5) | 25 (4) | NS |
| FEV1 (l) | 2.7 (0.8) | 0.96 (0.4) | <0.01 |
| FEV1 (% pred) | 102 (14) | 35 (14) | <0.01 |
| TLC (l) | 5.3 (0.8) | 7.4 (1.9) | <0.05 |
| TLC (% pred) | 97 (14) | 122 (24) | NS |
| RV (l) | 2.2 (0.5) | 4.2 (1.4) | <0.05 |
| RV (% pred) | 93 (16) | 189 (66) | <0.05 |
| Pao2 (kPa) | 12 (0.8) | 8.5 (0.4) | <0.01 |
| Paco2 (kPa) | 4.8 (0.4) | 5.1 (1.0) | NS |