Table 3.
Effect of BMI on outcome. Results are presented as adjusted and unadjusted OR for each outcome. BMI group 2 (BMI > 25 & <30) and group 3 (BMI > 30) were compared to the reference group 1 (BMI < 25).a
| BMI Groups | |||
|---|---|---|---|
| Outcome | <25 | >25–<30 | >30 |
| Mortality N (%) | 360 (0.46) | 303 (0.24) | 414 (0.18) |
| OR Unadj | Reference | 0.52 (0.44–0.60)* | 0.39 (0.34–0.45)* |
| OR Adj | Reference | 0.60 (0.51–0.70)* | 0.39 (0.33–0.45)* |
| Wound outcome N (%) | 748 (0.95) | 1,200 (0.94) | 1,875 (0.82) |
| OR Unadj | Reference | 0.99 (0.90–1.09) | 0.86 (0.79–0.93)** |
| OR Adj | Reference | 0.93 (0.82–1.07) | 0.74 (0.65–0.84)* |
| Cardiac outcome N (%) | 231 (0.29) | 306 (0.24) | 400 (0.17) |
| OR Unadj | Reference | 0.82 (0.69–0.97)** | 0.59 (0.50–0.70)* |
| OR Adj | Reference | 0.79 (0.62–1.00)** | 0.57 (0.45–0.71)* |
| Respiratory outcome N (%) | 736 (0.94) | 985 (0.77) | 1,631 (0.71) |
| OR Unadj | Reference | 0.82 (0.75–0.90)* | 0.76 (0.69–0.82)* |
| OR Adj | Reference | 0.99 (0.86–1.14) | 0.85 (0.75–0.97)** |
| Urinary outcome N (%) | 141 (0.18) | 235 (0.18) | 503 (0.22) |
| OR Unadj | Reference | 1.03 (0.83–1.27) | 1.22 (1.01–1.47)** |
| OR Adj | Reference | 1.00 (0.76–1.32) | 1.23 (0.96–1.57) |
| CNS outcome N (%) | 68 (0.09) | 71 (0.06) | 91 (0.04) |
| OR Unadj | Reference | 0.64 (0.46–0.90)** | 0.46 (0.33–0.63)* |
| OR Adj | Reference | 0.57 (0.36–0.91)** | 0.46 (0.30–0.70)** |
| Thromboembolism N (%) | 207 (0.26) | 313 (0.25) | 667 (0.29) |
| OR Unadj | Reference | 0.93 (0.78–1.11) | 1.10 (0.94–1.29) |
| OR Adj | Reference | 0.96 (0.75–1.24) | 1.06 (0.85–1.33) |
| Sepsis N (%) | 923 (1.18) | 1,399 (1.10) | 2,244 (0.98) |
| OR Unadj | Reference | 0.93 (0.86–1.02) | 0.83 (0.77–0.89)* |
| OR Adj | Reference | 0.94 (0.84–1.06) | 0.81 (0.72–0.90)** |
| Return to OR N (%) | 962 (1.23) | 1,295 (1.02) | 2,113 (0.92) |
| OR Unadj | Reference | 0.82 (0.76–0.90)* | 0.75 (0.69–0.81)* |
| OR Adj | Reference | 0.88 (0.77–1.00) | 0.74 (0.65–0.84)* |
| Composite morbidity N (%) | 2,256 (2.88) | 3,322 (2.61) | 5,595 (2.44) |
| OR Unadj | Reference | 0.91 (0.86–0.96)** | 0.84 (0.80–0.89)* |
| OR Adj | Reference | 0.91 (0.84–0.99) | 0.79 (0.74–0.86)* |
a
Variables considered and adjusted in the multivariate analysis were: underlying medical conditions [congestive heart failure within 30 days prior to surgery, severe COPD, acute renal failure (pre-operative), bleeding disorders, cancer, ascites within 30 days prior to surgery], preoperative treatments (dialysis, ventilation, chemotherapy, radiation therapy, and ASA classification.
*
p < 0.0001.
**
p < 0.05.