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

From: Age over 65 years and high levels of C-reactive protein are associated with the risk of preoperative deep vein thrombosis following closed distal femur fractures: a prospective cohort study

Variable

Cut-off value

Area under the curve (95% CI)

Sensitivity

Specificity

p value

Age (years)

65.5

0.721(0.644–0.799)

47.6%

85.5%

< 0.001

PLT (109/L)

217.1

0.605(0.518–0.693)

70.2%

50.0%

0.021

ALT (U/L)

21.5

0.605(0.518–0.692)

57.1%

60.5%

0.022

AST (U/L)

18.5

0.594(0.505–0.682)

67.9%

52.6%

0.041

CRP (mg/L)

11.2

0.746(0.669–0.823)

85.7%

59.2%

< 0.001

D-dimer (mg/L)

1.0

0.605(0.586–0.755)

69.0%

67.1%

< 0.001

  1. ROC receiver operating characteristic, CI confidence interval, PLT platelet, ALT alanine transaminase, AST aspartate transaminase, CRP C-reactive protein