Validity and Reliability of the German Quality of Life–Alzheimer's Disease (QoL-AD) Self-Report Scale

Vanessa Stypa, Peter Häussermann, Tim Fleiner, Sandra Neumann

Publication: Contribution to journalJournal articlesResearchpeer-review

Abstract

Background: The Quality of Life-Alzheimer's Disease (QoL-AD) scale is a widely used measure of quality of life (QoL) in dementia. Although the instrument has been validated in several languages, the psychometric properties of the German self-report version have not yet been analyzed. Objective: This study examines the internal consistency, test-retest reliability, and construct validity of the German QoL-AD self-report scale. Methods: The sample included 30 patients suffering from mild to moderate Alzheimer's disease or vascular dementia (19 females; mean age 77.3 years; mean Mini-Mental State Examination (MMSE) score 19.7 points). To determine test-retest reliability, the QoL-AD self-report scale was re-administered four to seven days apart. For construct validity analysis, the Dementia Quality of Life instrument (DQoL), Geriatric Depression Scale (GDS), MMSE, and an adapted short form of the Neuropsychiatric Inventory (NPI) were used. Results: The German QoL-AD self-report scale shows an internal consistency of α= 0.79 and a test-retest reliability of r = 0.75 (p 
Original languageEnglish
JournalJournal of Alzheimer's Disease
Volume77
Issue number2
Pages (from-to)581-590
Number of pages10
ISSN1387-2877
DOIs
Publication statusPublished - 01.07.2020

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