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Receiver Operator Characteristic (ROC) Curves to Predict MCI for Parameters of 8UG Test under Cognitive Dule-task (CT) Condition. The predictive ability of 8UG-CT is evaluated by using ROC analysis. Area under the curve (AUC) of 8UGCT (purple curve), DTCCT (yellow curve), the number of correct answers (blue curve) and the correct response rate (CRR, green curve) is 0.516 (p = 0.786), 0.520 (p = 0.731), 0.678 (p = 0.002) and 0.691 (p = 0.001). The dotted line represents reference line
