Table 2.
Bivariate statistics examining rates of hematoma stratified by risk factors.
| Risk factor (N) | Hematoma rate, % | p value |
|---|---|---|
| Age | ||
| <40 years (915) | 2.30% | Reference |
| ≥40 years (2,757) | 3.16% | 0.182 |
|
| ||
| Body mass index | ||
| 0–25 kg/m2 (861) | 3.02% | Reference |
| 25–40 kg/m2 (2,219) | 3.06% | 0.948 |
| >40 kg/m2 (254) | 3.15% | 0.916 |
|
| ||
| Operative time | ||
| 0–1.5 hours (914) | 1.64% | Reference |
| 1.5–3 hours (1,218) | 4.35% | <0.001 |
| >3 hours (1,549) | 2.65% | 0.106 |
|
| ||
| Multiple site surgery | ||
| No (3,291) | 2.95% | Reference |
| Yes (390) | 3.08% | 0.887 |
|
| ||
| Microsurgical procedure | ||
| No (3,433) | 2.71% | Reference |
| Yes (248) | 6.45% | 0.001 |
|
| ||
| Breast surgery | ||
| No (2,484) | 1.65% | Reference |
| Yes (1,197) | 5.68% | <0.001 |
|
| ||
| Post-bariatric body contouring surgery | ||
| No (3,434) | 2.91% | Reference |
| Yes (247) | 3.64% | 0.512 |
|
| ||
| Intravenous heparin during surgery | ||
| No (3,624) | 3.01% | Reference |
| Yes (57) | 0% | 0.184 |
|
| ||
| Intra- or post-operative aspirin | ||
| No (3.385) | 2.95% | Reference |
| Yes (296) | 3.04% | 0.933 |
|
| ||
| Post-operative enoxaparin per protocol | ||
| No (2,114) | 2.65% | Reference |
| Yes (1,567) | 3.38% | 0.194 |