Table 2.
Results of the multivariable regression analysis for persistent wound drainage
| Parameter | OR (95% CI) | p value |
| Allocation group | ||
| Aspirin | Reference | |
| Enoxaparin | 1.1 (0.7 to 1.9) | 0.63 |
| BMI per kg/m2 increase | 1.04 (1.02 to 1.08) | 0.003 |
| Heart disease | 0.6 (0.3 to 1.1) | 0.07 |
| Preoperative potent anticoagulation | 4.0 (1.8 to 8.8) | 0.001 |
| Preoperative single antiplatelet therapy | 2.9 (1.6 to 5.1) | < 0.001 |
| Skin closure | ||
| Staples | Reference | |
| Subcuticular | 0.1 (0.02 to 0.2) | < 0.001 |
| Arthroplasty type | ||
| THA | Reference | |
| TKA | 0.4 (0.2 to 0.6) | < 0.001 |
| Allocation*closure | 3.1 (1.1 to 10.2) | 0.04 |
| Joint type*closure | 5.4 (2.2 to 14.6) | 0.001 |
The terms “allocation*closure” and “joint type*closure” refer to the interaction terms between these variables included in the model.