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Interview for Deterioration in Daily Living Activities in Dementia: construct and concurrent validity in patients with mild to moderate dementia

Published online by Cambridge University Press:  28 September 2011

Sebastian Voigt-Radloff ,
Rainer Leonhart ,
Matthias Schützwohl ,
Luisa Jurjanz ,
Thomas Reuster ,
Antje Gerner ,
Kira Marschner ,
Fenna van Nes ,
Maud Graff  and
Myrra Vernooij-Dassen
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Sebastian Voigt-Radloff*
Affiliation:
Department of Occupational Therapy, Centre of Geriatric Medicine and Gerontology Freiburg, University Hospital Freiburg, Germany
Rainer Leonhart
Affiliation:
Department of Social Psychology and Methodology, University of Freiburg, Germany
Matthias Schützwohl
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Luisa Jurjanz
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Thomas Reuster
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Antje Gerner
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Kira Marschner
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Fenna van Nes
Affiliation:
Longitudinal Aging Study Amsterdam, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands
Maud Graff
Affiliation:
Alzheimer Centre Nijmegen, Scientific Institute for Quality in Health Care Rehabilitation-Occupational Therapy, Radboud University Medical Centre Nijmegen, The Netherlands
Myrra Vernooij-Dassen
Affiliation:
Alzheimer Centre Nijmegen, Scientific Institute for Quality in Health Care, Radboud University Medical Centre Nijmegen, Kalorama Foundation, The Netherlands
Marcel Olde Rikkert
Affiliation:
Alzheimer Centre Nijmegen, Department of Geriatrics, Radboud University Medical Centre Nijmegen, The Netherlands
Vjera Holthoff
Affiliation:
Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus Dresden, Germany
Michael Hüll
Affiliation:
Section of Gerontopsychiatry and Neuropsychology, Centre of Geriatric Medicine and Gerontology Freiburg, University Hospital Freiburg, Germany
*
Correspondence should be addressed to: Dr Sebastian Voigt-Radloff, Department of Occupational Therapy, Centre of Geriatric Medicine and Gerontology Freiburg, University Hospital Freiburg, Germany. Phone: +49 761 270 70860. Email: [email protected].
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Abstract

Background: The purpose of the study was to translate the Interview for Deterioration in Daily Living Activities in Dementia (IDDD) into German and to evaluate the construct and concurrent validity in people with mild to moderate dementia.

Methods: IDDD data of two pooled samples (n = 301) were analyzed regarding ceiling and bottom effects, internal consistency, factor reliability and correlations with corresponding scales on cognition and activities of daily living.

Results: We found minimal bottom (< 5%) and ceiling (≤ 2%) effects, good internal consistency (Cronbach's α > 0.7) and moderate to good factor reliability (0.66–0.87). Low correlations with cognition (Pearson coefficient: < 0.17) confirmed the differences between cognitive testing and activities of daily living (ADL). Minor correlations with other ADL scores (r < 0.2) indicated that different scores cover a different range of ADLs. The original two factor model could not be confirmed. A suggested four factor model distinguishing initiative and performance of basic and instrumental ADL demonstrated better indices of fit and higher correlations with corresponding scales.

Conclusion: A four factor model of the IDDD can be used in dementia research for assessing initiative in and performance of basic and household activities of daily living. The findings suggest that ADL scales correlate only poorly and that further development of the IDDD is needed to cover a broader range of ADLs.

Keywords

activities of daily livingdementiavalidation studies
Type
Research Article
Information
International Psychogeriatrics , Volume 24 , Issue 3 , March 2012 , pp. 382 - 390
Copyright
Copyright © International Psychogeriatric Association 2011

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