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Multicollinearity test of risk factors of PPCs
| Risk factors | VIF | Tolerance |
|---|---|---|
| Age (y) | 1.16 | 0.859 |
| ASA grade | 1.16 | 0.861 |
| Preoperative albumin (g/L) | 1.06 | 0.946 |
| Duration of surgery (h) | 1.93 | 0.518 |
| Estimated blood loss (L) | 1.85 | 0.542 |
| Accumulative occlusion time (min) | 1.57 | 0.637 |
Abbreviation: PPCs postoperative pulmonary complications, ASA American Society of Anesthesiologists, VIF variance inflation factor
