Comparison of pulmonary function indices in patients with COPD with and without anaemia
| Variable | Patients with low haemoglobin concentration (n=48) | Patients with normal haemoglobin concentration (n=109) |
|---|---|---|
| FEV1 (L) | 1.33±0.27 | 1.41±0.13 |
| FEV1 (%pred) | 42.15±7.53 | 43.28±5.72 |
| FEV1/FVC (%) | 41.32±2.19 | 43.36±1.38 |
| RV (L) | 3.98±1.55 | 4.11±1.24 |
| TLC (L) | 7.82±0.93 | 7.11±1.78 |
| RV/TLC (%) | 50.12±6.78 | 53.27±6.79 |
| IC (L) | 1.52±0.47 | 1.61±0.43 |
| DLco (L) | 15.31±1.94* | 17.10±2.05* |
Values represent numbers of patients or means+SD, as appropriate.
*p<0.05, patients with COPD with anaemia versus patients without anaemia using unpaired t test.
COPD, chronic obstructive pulmonary disease; DLco, carbon monoxide diffusion capacity corrected for haemoglobin concentration; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; IC, inspiratory capacity; RV, residual volume; TLC, total lung capacity.