Table 2.
Results of univariate analysis
| Factor | Odds ratio | p value (chi-square) |
| Age ≥40 years old | 6.637 | <0.01 |
| Age ≥50 years old | 4.362 | <0.01 |
| BMI ≥25 kg/m2 | 3.718 | <0.01 |
| BMI ≥28 kg/m2 | 3.911 | <0.05 |
| Smoking | 0.809 | n.s. |
| Hypertension | 3.018 | <0.01 |
| Abnormal glucose tolerance | 6.285 | <0.05 |
| Heart disease | 2.951 | <0.05 |
| Collagen disease | 2.161 | n.s. |
| Malignant tumor surgery | 8.327 | <0.01 |
| Retroperitoneal lymph node dissection | 7.577 | <0.01 |
| Perioperative bleeding ≥1,000 mL | 3.797 | <0.01 |
| Perioperative bleeding ≥2,000 mL | 4.252 | <0.01 |
| Blood transfusion | 7.152 | <0.01 |
| Operating time ≥4 hours | 5.999 | <0.01 |
| Operating time ≥6 hours | 5.516 | <0.01 |
BMI: body mass index
n.s.: not significant