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Dementia quality of life instrument--construct and concurrent validity in patients with mild to moderate dementia
S Voigt-Radloff1, R Leonhart, M Schützwohl
1Department of Occupational Therapy, Centre of Geriatric Medicine and Gerontology Freiburg, Germany. sebastian.voigt@uniklinik-freiburg.de
Background And Purpose:
To translate the Dementia quality of life instrument (DQoL) into German and assess its construct and concurrent validity in community-dwelling people with mild to moderate dementia.
Methods:
Dementia quality of life instrument data of two pooled samples (n=287) were analysed regarding ceiling and floor effects, internal consistency, factor reliability and correlations with corresponding scales on quality of life (Quality of Life in Alzheimer's Disease and SF-12), cognition (Mini-Mental State Examination, Alzheimer's Disease Assessment Scale - cognitive), depression (Cornell Scale for Depression in Dementia) and activities of daily living (Interview of Deterioration in Daily Living Activities in Dementia).
Results:
We found no floor effects (<2%), minor ceiling effects (1-11%), moderate to good internal consistency (Cronbach's α: 0.6-0.8) and factor reliability (0.6-0.8), moderate correlations with self-rated scales of quality of life (Spearman coefficient: 0.3-0.6) and no or minor correlations with scores for cognition, depression or activities of daily living (r<0.3). The original five-factor model could not be confirmed.
Conclusion:
The DQoL can be used in dementia research for assessing positive and negative affect, feelings of belonging and self-esteem. The findings suggest further research to improve the structure of the scales aesthetics, feelings of belonging and self-esteem.
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