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Table 3 The ROC curve analysis of continuous variables with statistical significance

From: The incidence and risk factors of deep venous thrombosis in lower extremities following surgically treated femoral shaft fracture: a retrospective case-control study

Variable Cutoff value Sensitivity Specificity AUC (95% CI) P value
Intra-op blood loss 550 ml 56.3% 66.5% 0.640 (0.557–0.723) 0.002
d-dimer 1.09 μg/ml 58.3% 74.6% 0.700 (0.619–0.782) < 0.001
Age 35 years 81.3% 44.6% 0.602 (0.523–0.681) 0.024