Table 6. Validity parameters for perioperative variables with statistical significance from multivariate analysis, for predicting postoperative infection.
| Variable | Sensitivity | Specificity | PPV | NPV | Accuracy |
|---|---|---|---|---|---|
| NNIS (> 1) | 68.8 | 75.0 | 73.3 | 70.6 | 71.9 |
| CRP > 30 mg/l on the 2nd POD | 31.2 | 100.0 | 100.0 | 57.7 | 64.5 |
| Preoperative albumin < 3.0 g/dl | 53.3 | 66.7 | 66.7 | 53.3 | 59.3 |
| CRP > 12 mg/l on the 5th POD | 87.5 | 83.3 | 87.5 | 83.3 | 85.7 |
| IL-6 > 25 pg/ml on the 5th POD | 81.2 | 75.0 | 81.2 | 75.0 | 78.6 |
| IL-6 > 50 pg/ml on the 2nd POD* | 73.3 | 75.0 | 73.3 | 75.0 | 74.2 |
NNIS = National Nosocomial Infection Surveillance score; POD = postoperative day; CRP = C-reactive protein; IL-6 = interleukin 6; PPV = positive predictive value; NPV = negative predictive value.
*
= p = 0.08 in multivariate analysis.