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Table 6 Risk factors for postoperative VTE

From: Risk factors for perioperative venous thromboembolism: A retrospective study in Japanese women with gynecologic diseases

Univariate analysis    
Variable p value
Age ≥50 years <0.01
Age ≥55 years <0.01
Malignant disease <0.01
Operating time ≥4 hours <0.05
Blood loss ≥1,000 ml <0.05
Blood loss ≥1,500 ml <0.05
Blood loss ≥2,000 ml <0.01
Blood transfusion ≥2,000 ml <0.05
Multivariate analysis    
Variable Risk ratio 95% CI p value
   Lower Upper  
Allergic-immunologic disease 4.816 1.010 22.956 <0.05
Malignant disease 6.035 1.881 19.359 <0.01
Blood transfusion ≥2,000 ml 6.206 1.248 30.862 <0.05
  1. CI: confidence interval; VTE: venous thromboembolism.