Assessing quality of life of older people with dementia: a comparison of quantitative self-report and proxy accounts.
OBJECTIVE
This article reports on a study of quality of life of older people with dementia, as assessed by the person with dementia, family carer and care staff.


BACKGROUND
People with dementia can give meaningful assessments of their quality of life, but these often differ from proxy ratings. In understanding this discrepancy, the influence of age, extent of cognitive impairment and activity limitation has been investigated. A lack of conclusive associations between quality of life ratings and these variables indicates a need for further research.


METHODS
Fifty-eight triads comprising the person with dementia, family carer and member of care staff from four long-term care facilities were surveyed on the quality of life-Alzheimer's Disease questionnaire between August and December 2007.


RESULTS
There was an important difference in the quality of life-Alzheimer's disease questionnaire total mean scores between groups, with the person with dementia providing the highest ratings. Level of impairment in activities of daily living had an important effect on quality of life ratings, with proxies, particularly care staff, providing lower ratings when there was greater activity limitation. This was not replicated for assessments made by the person with dementia. Age or level of cognitive impairment did not influence any ratings.


CONCLUSIONS
People with dementia can give assessments of their quality of life. However, discrepancy in ratings, with greater activity limitation affecting proxy ratings but not those made by the person with dementia, indicates the importance of including both self-report and proxy measures in research and care planning.
Research Centre for Clinical and Community Practice Innovation, Griffith Health Institute, Griffith University, Brisbane, Queensland, Australia. w.moyle@griffith.edu.au
Wendy
W
Moyle
Jenny E
JE
Murfield
Susan G
SG
Griffiths
Lorraine
L
Venturato
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000523:psychology; D017028:Caregivers; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009517:New South Wales; D015588:Observer Variation; D019727:Proxy; D011788:Quality of Life; D011793:Queensland; D015203:Reproducibility of Results; D057566:Self Report; D011795:Surveys and Questionnaires