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TA subsets

6. Subclavian or aortic bruit and age ≤40 at disease onset

3. Decreased brachia artery pulse and BP difference >10 mm Hg (between arms)

5. Subclavian or aortic bruit and decreased brachial artery pulse

Non-TA subsets

1. Absence of subclavian or aortic bruit and normal brachial artery pulse

2. Absence of subclavian or aortic bruit and BP difference <10 mm Hg (between arms)

4. Subclavian or aortic bruit, age >40 at disease onset, and normal brachial artery pulses

* The subset numbers also appear below the subset boxes in Figure 1. Missing data rules: If the information on subclavian or aortic bruit is not available, substitute arteriogram; if the arteriogram data are not available, substitute blood pressure (BP) difference (systolic; between arms), or as listed. The classification tree yields a sensitivity of 92.1% and a specificity of 97.0%. See Table 3 for definitions of criteria.