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Objectives: To examine the validity and reliability of a brief cognitive screen instrument, the Neuropsychiatry Unit Cognitive Assessment Tool (NUCOG), in patients with dementia, major psychiatric disorders and neurological disorders, and to compare its performance with the Mini-Mental State Examination (MMSE).

Method: The NUCOG was undertaken with the MMSE on a total of 347 individuals, with 82 subjects in the control group and 265 in the patient group. The patient group consisted of patients with dementia (n = 65), non-dementing neurological disorders (n = 44) and psychiatric illness (n = 156). The patient group was further broken into subgroups of dementing and psychiatric disorders for further analysis. A subgroup of patients (n = 22) underwent detailed neuropsychological testing.

Results: The NUCOG and MMSE scores, which …