Cox regression analysis for long-term mortality
| Factor | HR | 95% CI | P value |
| Age (10 years) | 1.43 | 1.03 to 1.98 | 0.031 |
| Gender (female) | 0.36 | 0.15 to 0.87 | 0.024 |
| Smoking within a year | 1.75 | 0.80 to 3.84 | 0.16 |
| Hypertension | 0.54 | 0.27 to 1.08 | 0.08 |
| LVEF (10%) | 0.59 | 0.46 to 0.76 | <0.001 |
| Types of procedure | 1.26 | 0.92 to 1.73 | 0.16 |
| Amount of transfusion (1000 mL) | 1.08 | 0.98 to 1.18 | 0.11 |
| Hematocrit on ICU admission (≥30%) | 0.40 | 0.20 to 0.80 | 0.01 |
| Length of ICU stay (day) | 1.05 | 1.03 to 1.07 | <0.001 |
ICU, intensive care unit; LVEF, left ventricular ejection fraction.