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Expected sensitivity and specificity of leg-specific ABI for classifying individuals with respect to underlying ABI at cutpoints of < 0.90 (Panel A) and > 1.30 (Panel B) with (Approach 1) and without (Approach 2) replicate SBP measurements. Summary: when the value of ABI is more than 0.05 units from the clinical cutpoints of 0.90 and 1.30, it reliably distinguishes patients with low and high ABI.
