Table 2. The multivariate adjusted odds ratios for postoperative infection.
| Model | One SD | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | |||||
| Odds Ratio | 95%CI | Odds Ratio | 95%CI | Odds Ratio | 95%CI | Odds Ratio | 95%CI | Odds Ratio | 95%CI | ||
| Male Gender | 0.92 | 0.36–2.32 | 0.89 | 0.35–2.31 | 1.45 | 0.47–4.46 | 1.30 | 0.41–4.14 | 1.51 | 0.45–4.9 | |
| Age (years) | 11.60 | 1.16 | 0.91–1.47 | 1.21 | 0.94–1.56 | 1.21 | 0.88–1.66 | 1.32 | 0.95–1.85 | 1.30 | 0.91–1.60 |
| BMI (kg/m2) | 3.80 | 0.81 | 0.54–1.23 | 0.80 | 0.52–1.21 | 0.89 | 0.557–1.39 | 0.88 | 0.56–1.38 | 0.91 | 0.58–1.41 |
| ASA1 (%) | 1(ref.) | 1(ref.) | 1(ref.) | 1(ref.) | 1(ref.) | ||||||
| ASA2 (%) | 3.01 | 0.98–9.21 | 2.89 | 0.90–9.30 | 3.52 | 0.75–16.41 | 3.45 | 0.72–16.55 | 3.40 | 0.70–16.75 | |
| ASA3 (%) | 3.66 | 0.59–22.80 | 3.60 | 0.55–23.62 | 2.75 | 0.30–25.47 | 3.00 | 0.31–29.15 | 2.60 | 0.30–26.40 | |
| DM (%) | 3.50 | 1.11–11.05* | 4.00 | 1.20–13.28 | 5.28 | 1.35–20.69 | 5.56 | 1.37–22.66 | 5.86 | 1.42–24.30 | |
| Total operation time | 114.10 | 1.55 | 0.88–2.74 | 1.58 | 0.88–2.84 | 1.62 | 0.79–3.29 | 1.76 | 0.84–3.68 | 1.71 | 0.81–3.50 |
| Log (blood loss) | 616.20 | 6.59 | 1.88–23.14** | 6.18 | 1.69–22.66** | 2.83 | 0.70–11.52 | 2.54 | 0.60–10.80 | 2.86 | 3.60–12.82 |
| Surgical procedure (%) | 2.20 | 0.79–6.11 | 2.40 | 0.82–7.00 | 2.74 | 0.77–9.76 | 3.32 | 0.88–12.50 | 3.21 | 0.90–12.24 | |
| CRP (mg/dl) | 3.50 | 1.51 | 0.93–2.43 | 1.52 | 0.86–2.67 | 1.53 | 0.90–2.71 | ||||
| ADN ratio | 0.20 | 14.90 | 4.62–48.00 | 15.73 | 4.64–53.37** | 15.20 | 4.50–51.13 | ||||
p<0.05,
p<0.01.
Model 1: Basic potential risk factors [gender, patient age, BMI, log (blood loss), ASA, T2DM, and the surgical procedure]; Model 2: Basic factors plus CRP levels; Model 3: Basic factors plus ADN ratio; Model 4: Basic factors plus preoperative ADN levels; Model 5: Basic factors plus CRP and preoperative ADN levels and ADN ratio. Blood loss was included in the models as log (blood loss), which was normally distributed, whereas CRP levels were mostly normally distributed. The odds ratio for each continuous variable was expressed for one standard deviation increase [11.61 for age; 3.82 for BMI; 616.17 for log (blood loss); 114.12 for time; 3.47 for CRP levels (POD 1); 5.09 for preoperative ADN levels; and 0.21 for ADN ratio]. The odds ratio was calculated for one standard deviation decrease only for the ADN ratio. CI: confidence interval.