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We evaluated 100 primary care outpatients for signs of cognitive impairment using the Mini-Mental State Examination (MMSE). The 23 subjects scoring abnormal values (less than 24/30) were found to be cognitively impaired. Seventeen had previously undetected cognitive impairment, while six had prior diagnoses consistent with cognitive impairment. Independent psychiatric evaluation identified these 23 outpatients as cognitively impaired, confirming the MMSE as a reliable, rapid instrument for cognitive assessment.
Goldschmidt et al. (1983) studied this question.