Table 2.

Estimates of diagnostic accuracy with 95% confidence intervals for the D-dimer and calf difference tests obtained in the full study population

Measures of diagnostic accuracy	D-dimer test (dichotomous)	Calf difference test (continuous per cm)
Sensitivity	0.94 (0.91 – 0.97)	-
Specificity	0.38 (0.35 – 0.41)	-
PPV	0.30 (0.27 – 0.33)	-
NPV	0.96 (0.94 – 0.98)	-
Odds Ratio	9.33 (5.70 – 15.3)	1.44 (1.33 – 1.56)
ROC area	-	0.69 (0.65 – 0.72)

- = not applicable; PPV = positive predictive value; NPV = negative predictive value ROC area = area under the receiver operating characteristic curve