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Quality of life in patients with cognitive impairment: validation of the Quality of Life–Alzheimer's Disease scale in Portugal

Published online by Cambridge University Press:  27 March 2013

Helena Bárrios*
Affiliation:
Dementia Group, Institute of Molecular Medicine and Faculty of Medicine, University of Lisbon, Lisbon, Portugal Hospital do Mar, Lisbon, Portugal
Ana Verdelho
Affiliation:
Laboratory of Neurosciences, Institute of Molecular Medicine and Faculty of Medicine, University of Lisbon, Lisbon, Portugal
Sofia Narciso
Affiliation:
Dementia Group, Institute of Molecular Medicine and Faculty of Medicine, University of Lisbon, Lisbon, Portugal
Manuel Gonçalves-Pereira
Affiliation:
CEDOC, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal
Rebecca Logsdon
Affiliation:
School of Nursing, University of Washington, Seattle, Washington, USA
Alexandre de Mendonça
Affiliation:
Laboratory of Neurosciences, Institute of Molecular Medicine and Faculty of Medicine, University of Lisbon, Lisbon, Portugal
*
Correspondence should be addressed to: Helena Bárrios, Hospital do Mar, Rua dos Girassóis, 6 e 6A, 2695-458 Bobadela, Portugal. Phone: 351-2-19948660; Fax: 351-2-19948679. Email: hsbarrios@hrmar.pt.

Abstract

Background: Quality of Life–Alzheimer's Disease (QOL-AD) is a widely used scale for the study of quality of life in patients with dementia. The aim of this study is the transcultural adaptation and validation of the QOL-AD scale in Portugal.

Methods: Translation and transcultural adaptation was performed according to state-of-the-art recommendations. For the validation study, 104 patient/caregiver pairs were enrolled. Patients had mild cognitive impairment or mild-to-moderate dementia (due to Alzheimer's disease or vascular dementia). Participants were recruited in a dementia outpatient clinic setting and a long-term care dementia ward. An additional comparison group of 22 patients without cognitive impairment, and their proxies, was recruited in a family practice outpatient clinic. Sociodemographic information on patients and caregivers was obtained. Acceptability, reliability, and construct validity were analyzed.

Results: Internal consistency of the Portuguese version of QOL-AD was good for both patient and caregiver report (Cronbach's α = 0.867 and 0.858, respectively). Construct validity was confirmed by the correlation of patient reported QOL-AD with patient geriatric depression scale scores (ρ = −0.702, p < 0.001) and satisfaction with life scale scores (ρ = 0.543, p < 0.001). Caregiver ratings were correlated with neuropsychiatric inventory (NPI) total score (ρ = −0.404, p < 0.001), NPI-distress (ρ = −0.346, p < 0.001), and patient Mini-Mental State Examination (ρ = 0.319, p < 0.01). QOL-AD patient ratings were higher than caregiver ratings (p < 0.001). Both patient- and caregiver-rated QOL-AD scores were lower in patients with cognitive impairment than in the comparison group without cognitive impairment (p < 0.01).

Conclusions: A Portuguese version of QOL-AD with consistent psychometric properties was obtained and is proposed as a useful tool for research and clinical purposes.

Type
Research Article
Copyright
Copyright © International Psychogeriatric Association 2013 

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