Table 5. Multivariate analysis by logistic and linear regression of perioperative variables, with statistical significance according to the presence of postoperative infection or length of hospital stay.
| Postoperative infection | Odds ratio | 95% CI | p |
| NNIS (> 1) | 10.60 | 1.10 to 102.00 | 0.04 |
| Preoperative albumin < 3.0 g/dl | 8.77 | 1.13 to 67.87 | 0.03 |
| CRP > 30 mg/l on the 2nd POD | 8.27 | 1.05 to 64.79 | 0.03 |
| CRP > 12 mg/l on the 5th POD | 25.92 | 2.17 to 332.71 | < 0.01 |
| IL-6 > 25 pg/ml on the 5th POD | 15.46 | 1.19 to 230.30 | 0.03 |
| Length of hospital stay (LOS) | β | 95% CI | p |
| Clinical diagnosis (cancer) | 11.11 | 1.20 to 21.03 | 0.03 |
| Transferrin on the 2nd POD | −0.24 | −0.46 to −0.02 | 0.03 |
| Albumin on the 5th POD | −8.13 | −13.97 to −2.30 | < 0.01 |
| IL-6 on the 5th POD | 0.04 | 0.01 to 0.07 | < 0.01 |
CI = confidence interval; POD = postoperative day, NNIS = National Nosocomial Infection Surveillance score; CRP = C-reactive protein; IL-6 = interleukin 6.