Seventeen of the patients were men and 67 were women, and the mean age was 75 (SD = 10.4). Eighty-four Alzheimer's disease patients with Clinical Dementia Rating (CDR) stages 2 (n = 32) or 3 (n = 52) and scores of less than 15 on the Korean version-Mini Mental State Examination (K-MMSE) participated in this study. The objective of this study was to evaluate the reliability and validity of a short form of the Severe Impairment Battery (SIB) for a Korean population. Conclusions: The Severe Cognitive Impairment Rating Scaleis a valid and reliable test for evaluating the cognitive function of advanced AD patients. Exploratory factor analysis yielded 2 factors (automatic informational processing and controlled informational processing) accounting for 73.5% of the total variance. It was robust to both the floor effect in the severe/profound stage of AD and the ceiling effect in the mild/moderate stage of AD. It showed significant correlation with Severe MMSE (r = 0.96, p < 0.01), MMSE (r = 0.86, p < 0.01) and Clinical Dementia Rating (r = –0.83, p < 0.01). The interrater reliability and test-retest reliability in the moderately to severely impaired subjects with an MMSE score of ≤14 was 0.99 (p < 0.001) and 0.90 (p < 0.001), respectively. Results: The internal consistency obtained by Cronbach’s coefficient α was 0.93. Methods: We constructed the Severe Cognitive Impairment Rating Scale, which consisted of 11 items covering memory, language, visuospatial function, frontal function and orientation, and investigated its reliability and validity on 267 subjects. Background/Aims: This study aimed to develop a brief, reliable and valid test for cognitive function of severely demented patients.

Mmse reliability and validity