Comparison of median haemoglobin decline by comorbidities
| Comorbidity | N (%) | Median haemoglobin decline (g/L) | P value | |
| COPD | Yes | 95 (32.5) | 1.5 | 0.244 |
| No | 197 (67.5) | 2.5 | ||
| ICU | Yes | 102 (34.9) | 4 | 0.03 |
| No | 190 (65.1) | 0.5 | ||
| Mechanical ventilation | Yes | 44 (15.1) | 3.5 | 0.237 |
| No | 248 (84.9) | 2 | ||
| Haemodialysis | Yes | 37 (12.7) | 1 | 0.056 |
| No | 255 (83.3) | 2 | ||
COPD, chronic obstructive pulmonary disease; ICU, intensive care unit.