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Development and evaluation of a short version of the quality of life questionnaire for dementia

Published online by Cambridge University Press:  27 August 2014

Seishi Terada ,
Etsuko Oshima ,
Chikako Ikeda ,
Satoshi Hayashi ,
Osamu Yokota  and
Yosuke Uchitomi
Seishi Terada*
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
Etsuko Oshima
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
Chikako Ikeda
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
Satoshi Hayashi
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
Osamu Yokota
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
Yosuke Uchitomi
Affiliation:
Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
*
Correspondence should be addressed to: Dr. Seishi Terada, Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan. Phone: +81-86-235-7242; Fax: +81-86-235-7246. Email: terada@cc.okayama-u.ac.jp.
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Abstract

Background:

There are many quality of life (QOL) instruments for evaluating dementia patients. The QOL questionnaire for Dementia (QOL-D) is one of such instruments and a validated objective measure of QOL for patients with dementia. It comprises 31 items encompassing six domains. However, with 31 items, its length is a disadvantage. The purpose of this study was to develop a short version of QOL-D (short QOL-D).

Methods:

We used data from two studies. The participants were 264 inpatients with dementia in the first sample and 395 outpatients at a memory clinic in the second sample. We used maximum likelihood factor analysis with promax rotation to reduce the number of items.

Results:

We produced a nine-item version of QOL-D (short QOL-D) with positive (six items) and negative (three items) dimensions. The correlation coefficients of short and total versions of QOL-D were 0.892–0.918 for total scores, 0.903–0.936 for positive dimension scores, and 0.788–0.837 for negative dimension scores. Total short QOL-D scores showed a significant correlation to the Geriatric Depression Scale score and the apathy score of the Neuropsychiatric Inventory.

Conclusions:

The short QOL-D produced results comparable with that of the full version. Reducing the number of items may make administration of the instrument easier.

Keywords

dementiafactor analysishealth-related QOLquality of life (QOL)
Type
Research Article
Information
International Psychogeriatrics , Volume 27 , Issue 1 , January 2015 , pp. 103 - 110
Copyright
Copyright © International Psychogeriatric Association 2014 

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