| Variables | OR | 95% CI | P-value |
| Sex | 1.32 | 1.26 - 1.46 | 0.06 |
| Age | 7.82 | 5.63 - 8.47 | 0.02 |
| Surgery type | 0.048 | 0.012 - 0.153 | <0.001 |
| Comobidities | 2.62 | 1.44 - 7.67 | <0.001 |
| Length of admission | 1.23 | 1.14 - 2.91 | 0.001 |
| BMI | 5.56 | 5.27 - 7.11 | 0.04 |
| SBP | 9.63 | 7.88 - 11.34 | 0.002 |
| DBP | 2.92 | 2.74 - 2.99 | 0.05 |
| SPO2 | 0.03 | 0.02 - 0.85 | <0.001 |
| eGFR | 4.35 | 2.74 - 7.55 | 0.001 |
| Biocarbonate | 0.23 | 0.21 - 1.46 | <0.001 |