Construct validity of the mini mental state examination across time in a sample with low-education levels: 10-year follow-up of the Bambuí Cohort Study of Ageing

Authors


Correspondence to: É. de Castro-Costa, PhD, E-mail: castro-costa@cpqrr.fiocruz.br

Abstract

Objective

The study aims to investigate whether longitudinal data on the structure of the mini mental state examination (MMSE) collected in an older Brazilian cohort support factorial invariance over time.

Design

Analysis of 10-year data from a community-based cohort study was performed.

Setting

The study took place in Bambuí, Brazil.

Participants

The study sample comprised 1558 (89.4%) of all eligible 1742 elderly residents.

Measurements

A standard Brazilian version of the MMSE was used.

Results

A five-factor solution (developed on the baseline of the cohort) either with no constraints or with loadings constrained to equality across time provided a reasonable fit for the MMSE. A comparison between both models suggested that the model with no constraints was superior. However, the five absolute goodness-of-fit indices suggest that the fully constrained model was also adequate and did not differ substantively from the model without any restriction.

Conclusion

The structure of the MMSE remained relatively unchanged across the 10 measurement times, thus providing evidence for the good construct validity of the scale across time. Copyright © 2014 John Wiley & Sons, Ltd.

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