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Table 2 Sensitivity, specificity, positive predictive value, negative predictive value and accuracy of the ankle brachial index at varying degrees of arterial occlusion

From: Ankle brachial index as a surrogate to vascular imaging in evaluation of peripheral artery disease in patients with type 2 diabetes

ABI Sonographic stenosis Sensitivity (%) Specificity (%) PPV (%) NPV (%) Accuracy (%)
  Mild None      
PAD 42 11 54 91 79 76 76.7
Normal 36 113      
  Moderate None      
PAD 75 11 93 91 87 95 91.7
Normal 6 113      
  Severe None      
PAD 36 11 100 91 77 100 93.1
Normal 0 113      
  1. ABI, ankle brachial index; PAD, peripheral artery disease; PPV, positive predictive value; NPV, negative predictive value
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