A study of validity and reliability of the Quality of Life-Alzheimer's Disease (Chinese version)

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A study of validity and reliability of the Quality of Life-Alzheimer's Disease (Chinese version)


Author: Chan, Lai-lok
Title: A study of validity and reliability of the Quality of Life-Alzheimer's Disease (Chinese version)
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Alzheimer's disease -- Patients -- Long term care
Quality of life -- Measurement.
Department: School of Nursing
Pages: viii, 127 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2303581
URI: http://theses.lib.polyu.edu.hk/handle/200/4548
Abstract: Background: "Quality of life" was identified as a central goal in the treatment of dementia (Logsdon et al., 2007). Measurement of quality of life is essential in clinical practice and is also one of the major outcome measures for interventions in dementia. The aim of this study is to establish the validity and reliability of the Chinese version of the Quality of Life - Alzheimer's Disease (C-QoL-AD). The QoL-AD is a 13-item instrument specifically designed to measure the quality of life of people with dementia. It is rated by both clients with dementia and their caregivers. Method: The content validity of the C-QoL-AD was established using an expert panel. All items were considered as culturally relevant, with slight modifications made. The C-QoL-AD was administered to 94 nursing home residents with dementia and their nurse caregivers. All except six residents with dementia were able to complete the C-QoL-AD. The convergent validity of C-QoL-AD was examined using correlation tests with Geriatric Depression Scale (GDS). The concurrent validity was evaluated through the correlation of Personal Wellbeing Index - Intellectual Disability (PWI-ID) with C-QoL-AD. Results: Findings of factor analysis showed that three factors were extracted with eigenvalues greater than 1 (5.58, 1.34, 1.01) and all items contributed to factor 1. It implied that the 13 items of C-QoL-AD functioned as a scale in measuring quality of life in dementia. A significant negative correlation (r=-0.414, p < 0.001) was found between the C-QoL-AD and GDS. A strong and positive correlation (r=0.83, p=0.01) was found between the C-QoL-AD and PWI-ID. The internal consistency of the C-QoL-AD was considered good; the Cronbach's alpha values of patient-report, caregiver report and weighted total score were 0.87, 0.83 and 0.89 respectively. Excellent test-retest reliability (ICC = 0.910) and inter-rater reliability (ICC = 0.984) of the C-QoL-AD was found. The C-QoL-AD shown a significant association with the Barthel Index (r=0.299, p=0.005). It did not show correlation with age, gender, duration of residential living, co-mobidity, financial status, visual functioning, Elderly Mobility Scale, and Mini-Mental State Examination score of individuals with dementia. Conclusion: The findings suggest that the C-QoL-AD is a valid and reliable instrument to evaluate the quality of life of older Hong Kong Chinese individuals with dementia living in long-term care settings.

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