OBJECTIVES: To explore whether Alzheimer's disease patients could rate their quality of life (QOL) using utility-based health indexes, and to provide new knowledge about the measurement properties of these instruments for patient and caregiver proxy ratings. METHODS: A convenience sample of 60 mild-moderate AD patients and their caregivers were randomized to complete the Quality of Well-Being Scale (QWB), Health Utilities Index (HUI3) or EQ-5D and visual analogue scale (VAS) on two occasions. Test-retest reliability (intraclass correlation coefficients) and convergent validity (Spearman correlations) of utility scores with global health status, activities of daily living, comorbidity, mood, cognition and other utility measures were assessed. RESULTS: Completion time was shortest for the combined EQ-5D and VAS. For patients with mild dementia and for proxies, reliability was >or= 0.70 for the EQ-5D, QWB and HUI3. The EQ-5D had a ceiling effect for patient ratings. Convergent validity was demonstrated for patient and proxy ratings, with the strongest validity for EQ-5D ratings and the weakest validity for HUI3 patient ratings. Mean patient utility scores were significantly higher than mean proxy scores for all measures (p<0.001). CONCLUSIONS: For patient and proxy ratings, the EQ-5D had the best combination of measurement properties, although it had a substantial ceiling effect for patient ratings. Proxy QOL ratings did not accurately reflect patients' ratings.
RCT Entities:
OBJECTIVES: To explore whether Alzheimer's diseasepatients could rate their quality of life (QOL) using utility-based health indexes, and to provide new knowledge about the measurement properties of these instruments for patient and caregiver proxy ratings. METHODS: A convenience sample of 60 mild-moderate ADpatients and their caregivers were randomized to complete the Quality of Well-Being Scale (QWB), Health Utilities Index (HUI3) or EQ-5D and visual analogue scale (VAS) on two occasions. Test-retest reliability (intraclass correlation coefficients) and convergent validity (Spearman correlations) of utility scores with global health status, activities of daily living, comorbidity, mood, cognition and other utility measures were assessed. RESULTS: Completion time was shortest for the combined EQ-5D and VAS. For patients with mild dementia and for proxies, reliability was >or= 0.70 for the EQ-5D, QWB and HUI3. The EQ-5D had a ceiling effect for patient ratings. Convergent validity was demonstrated for patient and proxy ratings, with the strongest validity for EQ-5D ratings and the weakest validity for HUI3 patient ratings. Mean patient utility scores were significantly higher than mean proxy scores for all measures (p<0.001). CONCLUSIONS: For patient and proxy ratings, the EQ-5D had the best combination of measurement properties, although it had a substantial ceiling effect for patient ratings. Proxy QOL ratings did not accurately reflect patients' ratings.
Authors: Gary Naglie; David B Hogan; Murray Krahn; B Lynn Beattie; Sandra E Black; Chris Macknight; Morris Freedman; Christopher Patterson; Michael Borrie; Howard Bergman; Anna Byszewski; David Streiner; Jane Irvine; Paul Ritvo; Janna Comrie; Matthew Kowgier; George Tomlinson Journal: Am J Geriatr Psychiatry Date: 2011-10 Impact factor: 4.105
Authors: Gary Naglie; David B Hogan; Murray Krahn; Sandra E Black; B Lynn Beattie; Christopher Patterson; Chris Macknight; Morris Freedman; Michael Borrie; Anna Byszewski; Howard Bergman; David Streiner; Jane Irvine; Paul Ritvo; Janna Comrie; Matthew Kowgier; George Tomlinson Journal: Am J Geriatr Psychiatry Date: 2011-10 Impact factor: 4.105
Authors: Emilia Castro-Monteiro; Maria João Forjaz; Alba Ayala; Carmen Rodriguez-Blazquez; Gloria Fernandez-Mayoralas; Alicia Diaz-Redondo; Pablo Martinez-Martin Journal: Qual Life Res Date: 2014-05-07 Impact factor: 4.147