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Optimal brachial and central systolic blood pressure thresholds. Youden index according to (A) brachial systolic blood pressure (BP) and (B) central systolic BP. Youden index is the maximal value obtained, a brachial systolic BP threshold of 121 mm Hg (95% CI, 120.2–121.9 mm Hg) and a central systolic BP threshold of 112 mm Hg (95% CI, 111.2–114.1 mm Hg).
