| Multivariate analysis |  | P value |
---|---|---|---|
 | RR | 95% CI | P |
Age | 0.416 | (0.089, 1.949) | 0.266 |
Gender | 0.572 | (0.175, 1.874) | 0.357 |
ASA | |||
 I–II | Reference |  |  |
 III–IV | 0.413 | (0.043, 4.004) | 0.446 |
BMI (kg/m2) | Â | Â | Â |
 18–25 | Reference |  |  |
 25–30 | 0.631 | (0.265, 1.729) | 0.471 |
 > 30 | 1.528 | (0.183, 2.395) | 0.552 |
LMWH bridging | Â | Â | Â |
 No bridging | Reference | ||
 Bridging | 6.560 | (1.748–14.616) | 0.005 |
Creatinine clearance (ml/min) | Â | Â | Â |
 > 60 | Reference |  |  |
 30–60 | 0.397 | (0.085, 1.764) | 0.236 |
 < 30 | 0.468 | (0.059, 2.708) | 0.322 |
Perioperative MAP (mmHg) | Â | Â | Â |
 < 60 | 1.020 | (0.523, 2.386) | 0.964 |
 60–70 | Reference |  |  |
 > 70 | 0.930 | (0.755, 1.295) | 0.781 |
Preoperative platelet(×109/L) | |||
 > 300 | 0.981 | (0.817, 1.179) | 0.834 |
 100–300 | Reference |  |  |
 70–100 | 1.060 | (0.892, 1.261) | 0.506 |
 < 70 | 1.732 | (1.036, 2.909) | 0.038 |
 Diabetes mellitus | 2.874 | (0.788, 5.968) | 0.432 |