Table 1.
Baseline characteristics of patients by mean 7-day hemoglobin concentration
| Characteristic | Hemoglobin | P value | |||
|---|---|---|---|---|---|
| <90 g/L ( n = 25) |
90-99 g/L (n = 61) |
100-109 g/L (n = 46) |
≥110 g/L (n = 37) |
||
| Age in years, mean (SD) | 39 (19) | 37 (18) | 36 (18) | 40 (15) | 0.83 |
| Male gender, number (percentage) | 17 (68) | 48 (80) | 38 (83) | 28 (76) | 0.55 |
| APACHE II score, mean (SD) | 26 (5) | 23 (4) | 24 (5) | 22 (4) | 0.56 |
| SBP <90 mm Hg, number (percentage) | 6 (24) | 10 (16) | 9 (20) | 7 (19) | 0.87 |
| PaO2 <70 mm Hg, number (percentage) | 3 (12) | 7 (11) | 3 (7) | 2 (5) | 0.65 |
| GCS score in 12 hours, median (IQR) | 6 (5-7) | 6 (6-7) | 6 (5-7) | 6 (6-7) | 0.56 |
| Mannitol, number (percentage) | 9 (36) | 31 (51) | 26 (57) | 19 (51) | 0.14 |
| CT of head, number (percentage) | |||||
| Traumatic subarachnoid hemorrhage | 17 (68) | 31 (51) | 21 (46) | 21 (57) | 0.32 |
| Diffuse axonal injury | 12 (48) | 21 (34) | 9 (20) | 9 (24) | 0.07 |
| Subdural hematoma | 11 (44) | 24 (39) | 17 (37) | 14 (38) | 0.95 |
| Features of increased ICP | 10 (40) | 31 (51) | 26 (57) | 20 (54) | 0.60 |
| Basal skull fracture | 3 (12) | 19 (31) | 12 (27) | 8 (22) | 0.29 |
| Craniotomy performed, number (percentage) | 8 (32) | 19 (31) | 23 (50) | 15 (41) | 0.22 |
APACHE II, Acute Physiology and Chronic Health Evaluation II; CT, computed tomography, GCS, Glasgow Coma Scale; ICP, intracranial pressure; PaO2, arterial partial pressure of oxygen; SBP, systolic blood pressure; SD, standard deviation.