Table 4. Regression analysis of need for transfusion.
| Variable | Univariable | Multivariable | |||||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | P value1 | OR | 95% CI | P value2 | ||
| Continuous1 | |||||||
| Age (years) | 1.1 | (1.0–1.1) | 0.041 | 1.0 | (0.9–1.1) | 0.918 | |
| BMI (kg/m2) | 1.0 | (0.9–1.1) | 0.795 | 1.0 | (0.9–1.1) | 0.760 | |
| Preoperative Hb (g/dL) | 0.3 | (0.1–0.4) | <0.001 | 0.3 | (0.1–0.5) | <0.001 | |
| Catagorical2 | |||||||
| Gender (male vs. female) | 0.4 | (0.1–1.0) | 0.075 | 1.4 | (0.3–6.7) | 0.676 | |
| Anticoagulant (yes vs. no) | 5.8 | (2.2–16.0) | <0.001 | 2.1 | (0.6–7.9) | 0.249 | |
| Tourniquet (yes vs. no) | 1.7 | (0.6–4.4) | 0.298 | 0.7 | (0.1–2.8) | 0.607 | |
| Anesthesia (regional vs. general) | 0.7 | (0.3–2.0) | 0.498 | 1.3 | (0.4–5.4) | 0.660 | |
| Drain placement (yes vs. no) | 0.4 | (0.1–1.2) | 0.142 | 0.4 | (0.1–1.5) | 0.195 | |
| TXA (yes vs. no) | 0.2 | (0.1–0.4) | <0.001 | 0.3 | (0.1–1.2) | 0.084 | |
1, odds ratio of needing transfusion for an increase of the independent variable by one unit; 2, odds ratio of needing transfusion for the specified binary category. OR, odds ratio; BMI, body mass index; Hb, hemoglobin; TXA, tranexamic acid.