Table 2. Physiological and radiological findings of patients with COPD.
| Variables | Anemic COPD | Non-anemic COPD | P value |
|---|---|---|---|
| Pulmonary function after bronchodilator (%) | |||
| FVC | 85.3±13.6 | 83.4±16.2 | 0.543 |
| FEV1 | 58.5±16.7 | 54.0±16.0 | 0.147 |
| FEV1/FVC | 47.2±11.9 | 46.7±11.0 | 0.818 |
| DLCO (%) [n] | 72.2±15.8 [27] | 77.9±24.4 [347] | 0.095 |
| DLCO/VA (%) [n] | 72.3±22.4 [26] | 78.6±23.9 [341] | 0.197 |
| RV/TLC (%) [n] | 48.8±11.5 [26] | 45.2±13.1 [351] | 0.170 |
| Six-minute walk test | |||
| 6MWD (m) [n] | 394.3±19.6 [26] | 429.2±85.7 [364] | 0.046 |
| Resting O2 Sat (%) [n] | 97.0±1.1 [26] | 96.4±1.8 [364] | 0.089 |
| Minimum O2 Sat (%) [n] | 95.5±2.1 [26] | 94.6±4.9 [364] | 0.345 |
| Radiological findings | |||
| Emphysema index [n] | 22.4±17.8 [21] | 21.7±15.5 [351] | 0.416 |
| Wall area (%) [n] | 65.7±5.4 [21] | 66.6±5.0 [351] | 0.420 |
| Air-trapping index (%) [n] | 0.94±0.04 [21] | 0.95±0.03 [351] | 0.235 |
| Frequent exacerbators (%) | 35 | 24.7 | 0.313 |
The number of participants is noted in square brackets, if any values for each item were missing. COPD, chronic obstructive pulmonary disease; DLCO/VA, diffusing capacity for carbon monoxide /alveolar volume; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; O2 Sat, oxygen saturation; 6MWD, 6-minute walk distance; RV, residual volume; TLC, total lung capacity; Wall area (%), wall area/(wall area + lumen area) ×100; Air trapping index (%), ratio of the mean lung density on expiration and inspiration ×100.