Table 3.

Comparison of Duplex Scanning With Arteriography for Detection of a Stenosis ≥50% in 20 Patients

Arterial SegmentSensitivity (%)Specificity (%)PPV* (%)NPV† (%)
Aorta100100100100
Iliac90907596
C. Femoral67988096
S. Femoral84939088
Profunda67815388
Femoris
Popliteal75978693
All segments82928093
  • *PPV indicates positive predictive value; †NPV, negative predictive value.

    None of the aortic segments had >50% stenosis.

    The kappa statistic for this comparison was 0.55; for the inter-rater comparison it was 0.63.