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Receiver operating characteristics (ROC) curve for prediction of cut-off values of total sleep time. The area under the ROC curve (AUC) for 6MWT, TUGT and sit-to stand test were 0.689 (P < 0.001), 0.517 (P = 0.935) and 0.680 (P = 0.056), respectively. 6MWT: 6-Minute Walk Test; TUGT: Time Up and Go Test.
