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BMC Psychiatry
Published in: BMC Psychiatry 1/2018

Open Access 01-12-2018 | Research article

The Erlangen test of activities of daily living in persons with mild dementia or mild cognitive impairment (ETAM) – an extended validation

Authors: Stephanie Book, Katharina Luttenberger, Mark Stemmler, Sebastian Meyer, Elmar Graessel

Published in: BMC Psychiatry | Issue 1/2018

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Abstract

Background

The ability to perform activities of daily living (ADLs) is a central marker in the diagnosis and progression of the dementia syndrome. ADLs can be identified as basic ADLs (BADLs), which are fairly easy to perform, or instrumental ADLs (IADLs), which involve more complex activities. Presently, the only performance-based assessment of IADL capabilities in persons with cognitive impairment is the Erlangen Test of Activities of Daily Living in Persons with Mild Dementia or Mild Cognitive Impairment (ETAM). The aim of the present study was to revalidate the ETAM in persons with mild cognitive impairment (MCI) or mild dementia and to analyze its application to persons with moderate dementia.

Methods

We used baseline data from a cluster randomized controlled trial involving a sample of 443 users of 34 day-care centers in Germany. We analyzed groups of persons with MCI, mild dementia, and moderate dementia, categorized on the basis of the Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA). An item analysis was performed, and new discriminant validities were calculated. We computed a confirmatory factor analysis (CFA) to examine the postulated theoretical model of the ETAM with all six items loading on a single IADL factor. This was the first time that the ETAM’s sensitivity to change was analyzed after a time period of 6 months.

Results

The overall sample scored on average 17.3 points (SD = 7.2) on the ETAM (range: 0–30 points). Persons with MCI scored on average 23.2 points, persons with mild dementia scored 18.4 points, and persons with moderate dementia scored 12.9 points, p < .001 (ANOVA). The item analysis yielded good difficulty indices and discrimination powers. The CFA indicated a good fit between the model and the observed data. After 6 months, both the ETAM score at baseline and the change in MMSE score (t0-t1) were significant predictors of the ETAM score at t1.

Conclusions

The ETAM is a valid and reliable instrument for assessing IADL capabilities in persons with MCI or mild dementia. It is sensitive to changes in cognitive abilities. The test parameters confirm its application to persons with moderate dementia.

Trial registration

Identifier: ISRCTN16412551 (Registration date: 30 July 2014, registered retrospectively).
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Metadata
Title
The Erlangen test of activities of daily living in persons with mild dementia or mild cognitive impairment (ETAM) – an extended validation
Authors
Stephanie Book
Katharina Luttenberger
Mark Stemmler
Sebastian Meyer
Elmar Graessel
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Psychiatry / Issue 1/2018
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/s12888-018-1886-5

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