Demographic and clinical characteristics of patients included in the study
| Variable | Patients with low haemoglobin concentration (%) | Patients with normal haemoglobin concentration (%) |
|---|---|---|
| Number of patients (n=157) (%) | 48 (31%) | 109 (69%) |
| Sex | Men (M) 45(94%) | Men (M) 99 (91%) |
| Age (years) | 61.32±6.03 | 60.82±7.13 |
| BMI (kg/m2) | 21.72±2.93 | 22.18±2.15 |
| Haemoglobin concentration (g/dL) | 10.6±0.8* | 12.9±1.1* |
| MCV(fL) | 85.9±9.1 | 87.1±10.2 |
| Smoking index (pack-years) | 43.58±7.70 | 45.56±4.63 |
| pH | 7.39±0.017 | 7.38±0.023 |
| PaCO2 (mm Hg) | 44.67±1.32 | 44.31±1.28 |
| PaO2 (mm Hg) | 68.11±3.01 | 67.33.±3.62 |
| SaO2 (%) | 94.44±0.94 | 94.77±1.13 |
Values represent numbers of patients or means+SD, as appropriate.
*p<0.05, patients with COPD with anaemia versus patients without anaemia using unpaired Student t test.
BMI, body mass index; COPD, chronic obstructive pulmonary disease; MCV, mean corpuscular (erythrocyte) volume; PaCO2, carbon dioxide partial pressure; PaO2, oxygen partial pressure.