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Dement Geriatr Cogn Disord. 2012;33(2-3):118-24. doi: 10.1159/000337387. Epub 2012 Apr 12.

Mini-Cog and Mini-Mental State Examination: agreement in a cross-sectional study with an elderly sample.

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1
Institute of Public Health of the University of Porto, Department of Clinical Epidemiology, Predictive Medicine and Public Health, University of Porto Medical School, Rua das Taipas 135–139, Porto, Portugal. dmcosta@med.up.pt

Abstract

BACKGROUND/AIMS:

We aimed to compare the Mini-Mental State Examination (MMSE) with the Mini-Cog, measuring agreement in participants' classification, using a general population sample.

METHODS:

Cross-sectional evaluation of 609 community dwellers aged ≥60 years was performed by trained interviewers. Cohen's kappa and 95% confidence intervals (CI) were calculated to assess overall agreement, and Cronbach alphas computed to assess reliability. Two-parameter Item Response Theory models (difficulty and discrimination parameters) were used to assess discrimination.

RESULTS:

Considering MMSE cut-point for scores <24, 3.1% of the participants would be 'cognitive impaired' and 6.2% considering cut-point scores <25. Following Mini-Cog's cut-point score <3, 11.3% would be impaired. For MMSE cut-point <24 and Mini-Cog <3, we observed a Cohen's kappa of 0.116 (95% CI: -0.073 to 0.305), and of 0.258 (95% CI: 0.101-0.415) for cut-point <25. The highest kappa was obtained for cut-point <26 on the MMSE and Mini-Cog <3 (kappa = 0.413). MMSE Cronbach alpha was 0.6108 and Mini-Cog's alpha was 0.2776. Co-calibration according to inherent ability is graphically presented.

CONCLUSIONS:

Agreement between scales seems fragile in our sample. The discriminative and reliability analysis suggests a better performance for subsets of the MMSE compared with the Mini-Cog. Usefulness of calibrated scores is discussed.

PMID:
22508578
DOI:
10.1159/000337387
[Indexed for MEDLINE]
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