Table 2.

Sensitivity, specificity, PPV, and NPV for duplex ultrasound, arm arterial HDA, and their combination in comparison with CTA.

Test/combination	TP, n	TN, n	FP, n	FN, n	Sensitivity, %	Specificity, %	PPV, %	NPV, %
Duplex ultrasound	13	35	36	2	86.7	49.3	26.5	94.6
Arm arterial HDA	11	56	15	4	73.3	78.9	42.3	93.3
Duplex ultrasound + arm arterial HDA	14	30	41	1	93.3	42.3	25.5	96.8

CTA = computed tomography angiography, FN = false-negative, FP = false-positive, HDA = hemodynamic assessment, NPV = negative predictive value, PPV = positive predictive value, TN = true-negative, TP = true-positive.