Table 3.
Logistic regression models for predicting 30-day morbidity.
| Variable | Model 4—entire sample | Model 5—diabetics with general surgery sub-group | Model 6—diabetics with vascular surgery sub-group |
|---|---|---|---|
| Model R-square | |||
| 0.225 | 0.204 | 0.111 | |
| Odds ratio (95% CI) | Odds ratio (95% CI) | Odds ratio (95% CI) | |
| Diabetes | |||
| Nondiabetic | Reference category | ||
| Diabetic—oral | 0.96 (0.92, 1.01) | Reference category | Reference category |
| Diabetic—insulin | 1.11 (1.06, 1.16)* | 1.20 (1.12, 1.29)* | 1.24 (1.12, 1.38)* |
| Anesthesia technique | |||
| General | Reference category | Reference category | Reference category |
| Epidural | 0.97 (0.80, 1.12) | 1.11 (0.51, 2.36) | 1.13 (0.81, 1.57) |
| Spinal | 0.63 (0.57, 0.69)* | 0.57 (0.41, 0.80)* | 1.08 (0.91, 1.29) |
| Regional | 0.39 (0.33, 0.47)* | 0.66 (0.28, 1.57)* | 0.39 (0.29, 0.53)* |
| Local | 0.32 (0.23, 0.43)* | 0.33 (0.15, 0.75)* | 0.36 (0.14, 0.91)* |
| Monitored anesthesia care | 0.38 (0.34, 0.41)* | 0.34 (0.27, 0.44)* | 0.44 (0.35, 0.56)* |
| Other | 0.28 (0.17, 0.46)* | 0.00 (0.00, α) | 0.56 (0.19, 1.66) |
| None | 1.09 (0.50, 2.37) | 1.08 (0.12, 10.2) | 1.44 (0.19, 10.9) |
| Surgical specialty: vascular | 1.69 (1.62, 1.75)* | ||
| Male gender | 1.01 (0.98, 1.03) | 1.00 (.095, 1.09) | 0.90 (0.78, 0.94)* |
| Ventilator dependent | 3.24 (2.87, 3.65)* | 3.19 (2.47, 4.13)* | 4.22 (2.61, 6.81)* |
| COPD | 1.43 (1.37, 1.50)* | 1.60 (1.43, 1.78)* | 1.41 (1.23, 1.61)* |
| Cardiac risk factors | 1.27 (1.23, 1.31)* | 1.24 (1.12, 1.36)* | 1.33 (1.09, 1.63)* |
| On dialysis | 0.91 (0.84, 0.98)* | 1.13 (0.95, 1.33) | 1.02 (0.89, 1.17) |
| Steroid use | 1.48 (1.39, 1.59)* | 1.47 (1.25, 1.72)* | 1.07 (0.85, 1.36) |
| 10% weight loss | 2.24 (2.07, 2.42)* | 2.22 (1.84, 2.67)* | 1.47 (1.04, 2.09)* |
| Sepsis | |||
| None | Reference category | Reference category | Reference category |
| Sepsis | 1.84 (1.72, 1.97)* | 1.89 (1.62, 2.19)* | 1.65 (1.34, 2.03)* |
| Septic shock | 2.73 (2.40, 3.10)* | 3.42 (2.60, 4.49)* | 1.98 (1.21, 3.22)* |
| SIRS | 1.63 (1.55, 1.71)* | 1.59 (1.40, 1.81)* | 1.70 (1.41, 2.04)* |
| Emergent case | 1.57 (1.51, 1.63)* | 1.50 (1.35, 1.66)* | 1.82 (1.54, 2.14)* |
| ASA class | |||
| No ASA class assigned | Reference category | Reference category | Reference category |
| No disturbance | 0.42 (0.29, 0.60)* | 0.60 (0.17, 2.08 | 3.39 (0.68, 16.9) |
| Mild disturbance | 1.00 (0.70, 1.42) | 0.68 (0.25, 1.85) | 1.72 (0.54, 5.42) |
| Severe disturbance | 2.29 (1.62, 3.26)* | 1.19 (0.44, 3.24) | 2.26 (0.73, 6.95) |
| Life threatening | 4.92 (3.46, 7.00)* | 2.51 (0.92, 6.86) | 3.99 (1.29, 12.3)* |
| Moribund | 5.85 (3.92, 8.73)* | 1.92 (0.64, 5.78) | 10.0 (2.37, 42.3)* |
| Wound classification | |||
| Clean | Reference category | Reference category | Reference category |
| Clean/contaminated | 1.99 (1.93, 2.07)* | 1.99 (1.82, 2.16)* | 1.32 (1.07, 1.63)* |
| Contaminated | 1.98 (1.88, 2.08)* | 2.31 (2.02, 2.63)* | 1.31 (1.06, 1.62)* |
| Dirty/infected | 2.38 (2.25, 2.51)* | 2.46 (2.15, 2.81)* | 1.15 (0.98, 1.35) |
Values expressed as odds ratios (95% confidence intervals x, y). *Significance at P < 0.05. COPD: chronic obstructive pulmonary disease, ASA: American Society of Anesthesiologists, SIRS: systemic inflammatory response syndrome, and CI: confidence interval.