Table II.
Results of multivariable logistic regression analysis for predictors of 30-day post-discharge surgical site infection.
| Variables | OR | 95% CI | P-value |
|---|---|---|---|
| Demographics | |||
| Female gender | 1.4 | (1.3, 1.5) | <.0001 |
| Age ≥ 65 | 0.9 | (0.9, 1.0) | .0426 |
| Race: | |||
| White | Reference | ||
| Black | 0.8 | (0.7, 0.9) | .0002 |
| Other | 0.9 | (0.8,1.0) | .2041 |
| Comorbidities | |||
| BMI | |||
| Normal | Reference | ||
| Overweight | 1.3 | (1.2,1.5) | <.0001 |
| Obese | 2.3 | (2.1, 2.5) | <.0001 |
| Underweight | 0.8 | (0.7, 1.1) | .1323 |
| Diabetes | |||
| No Diabetes | Reference | ||
| Non-insulin (PO) | 1.2 | (1.1, 1.3) | .0019 |
| Insulin | 1.3 | (1.2, 1.4) | <.0001 |
| Smoker | 1.2 | (1.1, 1.3) | <.0001 |
| Hypertension | 1.2 | (1.1, 1.4) | .0002 |
| Coronary Artery Disease | 1.1 | (1.0, 1.2) | .0307 |
| Critical Limb Ischemia | 1.2 | (1.1, 1.3) | <.0001 |
| Functional status | |||
| Independent | Reference | ||
| Partially dependent | 1.1 | (1.0, 1.2) | .0856 |
| Totally dependent | 0.5 | (0.4, 0.8) | .0066 |
| COPD | 1.1 | (1.1, 1.2) | .0327 |
| Dyspnea | |||
| None | Reference | ||
| Moderate exertion | 1.2 | (1.1, 1.3) | .0004 |
| At rest | 1.2 | (0.9, 1.6) | .1457 |
| Neurological Disease | 1.1 | (1.0, 1.3) | .0088 |
| Bleeding disorder | 1.1 | (1.0, 1.2) | .1389 |
| Loss of weight | 0.7 | (0.5, 1.0) | .0627 |
| Perioperative Characteristics | |||
| Emergency Case | 1.1 | (1.0, 1.3) | .1055 |
| Operation time | |||
| <4 hours | Reference | ||
| 4–6 hours | 1.4 | (1.3, 1.5) | <.0001 |
| >6 hours | 1.5 | (1.4, 1.7) | <.0001 |
| Operative Procedure | |||
| AAA | Reference | ||
| Open Aortoiliac | 2.4 | (1.9, 2.9) | <.0001 |
| Lower extremity revascularization | 3.1 | (2.5, 3.8) | <.0001 |
| Groin anastamosis | 1.2 | (1.0, 1.4) | .0110 |
| Graft | |||
| None | Reference | ||
| Vein | 0.9 | (0.7, 1.1) | .4533 |
| Other than vein | 0.8 | (0.7, 1.0) | .0717 |
| ASA class: | |||
| I or II | Reference | ||
| III | 1.1 | (0.9, 1.3) | .4209 |
| IV or V | 1.2 | (1.0, 1.4) | .0411 |
| Complications | |||
| Renal | 0.6 | (0.4, 0.9) | .0270 |
| Graft Loss | 0.2 | (0.0, 1.5) | .1242 |
| Sepsis | 0.7 | (0.5, 0.9) | .0118 |
| Other Adverse Outcomes | |||
| Prolonged LOS (≥14-days) | 0.4 | (0.3, 0.5) | <.0001 |
The unadjusted area under the receiver operator curve (ROC) of the model (c-statistic) was 0.694 (95% CI: 0.682 – 0.706). The adjusted ROC of the model was 0.691 (95% CI: 0.679 – 0.703).
OR, odds ratio; CI, confidence interval; LOS, Length of Stay; ASA, American Society of Anesthesiologists.