title: Dementia quality of life instrument--construct and concurrent validity in patients with mild to moderate dementia.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
authors: Department of Occupational Therapy, Centre of Geriatric Medicine and Gerontology Freiburg, Germany. sebastian.voigt@uniklinik-freiburg.de
authors: S
authors: S
authors: Voigt-Radloff
authors: R
authors: R
authors: Leonhart
authors: M
authors: M
authors: Schützwohl
authors: L
authors: L
authors: Jurjanz
authors: T
authors: T
authors: Reuster
authors: A
authors: A
authors: Gerner
authors: K
authors: K
authors: Marschner
authors: F
authors: F
authors: van Nes
authors: M
authors: M
authors: Graff
authors: M
authors: M
authors: Vernooij-Dassen
authors: M O
authors: MO
authors: Rikkert
authors: V
authors: V
authors: Holthoff
authors: M
authors: M
authors: Hüll
mesh_terms: D000368:Aged; D003704:Dementia / Q000523:psychology*; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D009483:Neuropsychological Tests; D011788:Quality of Life / Q000523:psychology*