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

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

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

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