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The receiver operating characteristic (ROC) analysis to determine the cutoff scores of the sum of boxes of the Clinical Dementia Rating Scale for normal cognition/subjective cognitive decline (SCD), SCD/mild cognitive impairment (MCI), and MCI/mild dementia among (A) the AD group, (B) the CVD/VCI group, (C) the LBD group, (D) the OD group and (E) all participants.
