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Fig. 2 | BMC Geriatrics

Fig. 2

From: Vitamin D supplementation as a potential cause of U-shaped associations between vitamin D levels and negative health outcomes: a decision tree analysis for risk of frailty

Fig. 2

Receiver operating characteristic (ROC) curve analyses for risk of frailty predicted by the classification and regression tree (CART) analysis groups (blue line) and 25-hydroxyvitamin D (25 (OH) D) level (green line). 25 (OH) D: Serum total 25-hydroxyvitamin D. CART: Classification and regression tree. Area under the ROC curve (AUC) = 0.73 (95% confidence interval (CI) = 0.65–0.82, p < 0.001) for CART analysis groups (blue line); AUC = 0.56 (95%CI = 0.46–0.66, p = 0.32) for 25 (OH) D (green line)

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