Comparison of preoperative patient characteristics between the low-hematocrit and the high-hematocrit groups
| Characteristic | Hematocrit <30% (n=86) | Hematocrit ≥30% (n=86) | P value |
| Gender, ratio of male (%) | 50 (58%) | 59 (69%) | 0.21 |
| Age (years) | 71 (63 – 76) | 68.5 (61 – 76) | 0.39 |
| Height (cm) | 160 (152.5 – 167) | 163 (155 – 168.4) | 0.29 |
| Weight (kg) | 60 (50 – 70.8) | 63 (54.2 – 70.0) | 0.11 |
| Smoking within a year | 38 (44%) | 50 (58%) | 0.093 |
| Diabetes mellitus | 21 (24%) | 21 (24%) | 1 |
| Hyperlipidemia | 23 (27%) | 35 (41%) | 0.076 |
| Renal dialysis | 11 (13%) | 6 (7%) | 0.31 |
| Hypertension | 67 (78%) | 69 (80%) | 0.85 |
| Chronic respiratory disease | 7 (8%) | 7 (8%) | 1 |
| History of cardiovascular operation | 11 (13%) | 16 (19%) | 0.4 |
| History of PCI | 10 (12%) | 12 (14%) | 0.82 |
| Consciousness abnormality within 24 hours | 12 (14%) | 6 (7%) | 0.21 |
| Acute myocardial infarction | 15 (17%) | 17 (20%) | 0.85 |
| Angina pectoris | 0.38 | ||
| Stable | 4 (5%) | 8 (9%) | |
| Unstable | 11 (13%) | 14 (16%) | |
| Cardiogenic shock | 13 (15%) | 9 (10%) | 0.49 |
| LVEF (%) | 60 (55.5 – 70) | 64 (54.3 – 70) | 0.63 |
| Hemoglobin (g/L) | 103 (90 to 115) | 107 (97 to 116) | 0.32 |
| Hematocrit (%) | 30 (27 – 34) | 31 (29 – 34) | 0.36 |
| Preoperative serum creatinine (mg/dL) | 1.18 (0.81 – 1.72) | 0.99 (0.84 – 1.35) | 0.2 |
Quantitative data are expressed as medians (first to third IQRs), and categorical data are expressed as frequencies (percentages).
LVEF, left ventricular ejection fraction; PCI, percutaneous coronary intervention.