Table 2.
Number of adverse events, infection, readmissions and mortality for patients of varying body mass index (BMI)
| BMI<18.5 kg/m2 | BMI 18.5–24.9 kg/m2 | BMI 25.0–29.9 kg/m2 | BMI 30.0–39.9 kg/m2 | BMI 40.0–49.9 kg/m2 | BMI ≥ 50.0 kg/m2 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Underweight | Normal weight | Overweight | Obese | Morbidly obese | Super morbidly obese | |||||||
| Total number of patients (n=51,149) | n=421 | n=10,199 | n=17,425 | n=19,233 | n=3,333 | n=538 | ||||||
| Number | Percent | Number | Percent | Number | Percent | Number | Percent | Number | Percent | Number | Percent | |
| Any adverse event (AAE) | 23 | 5.46% | 277 | 2.72% | 429 | 2.46% | 497 | 2.58% | 97 | 2.91% | 30 | 5.58% |
| Serious adverse event (SAE) | 16 | 3.80% | 176 | 1.73% | 272 | 1.56% | 289 | 1.50% | 62 | 1.86% | 18 | 3.35% |
| Deep infection | 3 | 0.71% | 36 | 0.35% | 58 | 0.33% | 61 | 0.32% | 12 | 0.36% | 3 | 0.56% |
| Sepsis | 3 | 0.71% | 37 | 0.36% | 51 | 0.29% | 40 | 0.21% | 7 | 0.21% | 3 | 0.56% |
| Failure to wean | 3 | 0.71% | 54 | 0.53% | 63 | 0.36% | 61 | 0.32% | 13 | 0.39% | 5 | 0.93% |
| Reintubation | 11 | 2.61% | 64 | 0.63% | 78 | 0.45% | 84 | 0.44% | 17 | 0.51% | 2 | 0.37% |
| Renal failure | 0 | 0.00% | 6 | 0.06% | 2 | 0.01% | 6 | 0.03% | 2 | 0.06% | 1 | 0.19% |
| Thromboembolic events | 1 | 0.24% | 32 | 0.31% | 61 | 0.35% | 80 | 0.42% | 16 | 0.48% | 4 | 0.74% |
| Cardiac arrest | 2 | 0.48% | 12 | 0.12% | 27 | 0.15% | 15 | 0.08% | 5 | 0.15% | 2 | 0.37% |
| MI | 1 | 0.24% | 11 | 0.11% | 21 | 0.12% | 23 | 0.12% | 4 | 0.12% | 2 | 0.37% |
| Stroke | 1 | 0.24% | 14 | 0.14% | 17 | 0.10% | 13 | 0.07% | 2 | 0.06% | 1 | 0.19% |
| Minor adverse event (MAE) | 12 | 2.85% | 158 | 1.55% | 230 | 1.32% | 267 | 1.39% | 50 | 1.50% | 19 | 3.53% |
| Superficial infection | 1 | 0.24% | 34 | 0.33% | 44 | 0.25% | 77 | 0.40% | 15 | 0.45% | 4 | 0.74% |
| Dehiscence | 0 | 0.00% | 9 | 0.09% | 10 | 0.06% | 12 | 0.06% | 4 | 0.12% | 1 | 0.19% |
| Pneumonia | 8 | 1.90% | 72 | 0.71% | 102 | 0.59% | 102 | 0.53% | 22 | 0.66% | 5 | 0.93% |
| UTI | 5 | 1.19% | 48 | 0.47% | 80 | 0.46% | 82 | 0.43% | 12 | 0.36% | 10 | 1.86% |
| Post renal insufficiency | 0 | 0.00% | 3 | 0.03% | 5 | 0.03% | 6 | 0.03% | 1 | 0.03% | 0 | 0.00% |
| Postoperative infections | 12 | 2.85% | 151 | 1.48% | 229 | 1.31% | 273 | 1.42% | 47 | 1.41% | 16 | 2.97% |
| Readmission within 30 d of operation ‡ | 15 | 3.56% | 241 | 2.36% | 407 | 2.34% | 496 | 2.58% | 95 | 2.85% | 20 | 3.72% |
| Mortality within 30 d of operation | 3 | 0.71% | 24 | 0.24% | 23 | 0.13% | 22 | 0.11% | 7 | 0.21% | 4 | 0.74% |
| Median | ±SD | Median | ±SD | Median | ±SD | Median | ±SD | Median | ±SD | Median | ±SD | |
| Length of stay (d) | 1 | 1–2 | 1 | 1–2 | 1 | 1–2 | 1 | 1–2 | 1 | 1–2 | 1 | 1–2 |
| Operative time (min) | 112 | 77–167 | 109 | 79–153 | 112 | 81–156 | 114 | 82–160 | 115 | 85–162 | 121 | 86–171 |
IQR, inter quartile range.