Fig. 6From: Calf circumference predicts frailty in older adults: the Chinese longitudinal healthy longevity surveyROC curve analysis of CC for frailty in men. AUC = 0.592 (95% CI: 0.528–0.656; P = 0.004); CC cut-off point in men = 29.5 cm; Youden index = 0.164; Sensitivity: 82.7%; Specificity: 33.7%Back to article page