Performance of the assessment of quality of life measure in people with hip and knee joint disease and implications for research and clinical use

Ackerman, Ilana N, Busija, Lucy, Tacey, Mark A, Bohensky, Megan A, Ademi, Zanfina, Brand, Caroline A and Liew, Danny 2014, Performance of the assessment of quality of life measure in people with hip and knee joint disease and implications for research and clinical use, Arthritis Care and Research, vol. 66, no. 3, pp. 481-488, doi: 10.1002/acr.22129.

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Title Performance of the assessment of quality of life measure in people with hip and knee joint disease and implications for research and clinical use
Author(s) Ackerman, Ilana N
Busija, Lucy
Tacey, Mark A
Bohensky, Megan A
Ademi, Zanfina
Brand, Caroline A
Liew, Danny
Journal name Arthritis Care and Research
Volume number 66
Issue number 3
Start page 481
End page 488
Total pages 8
Publisher John Wiley and Sons Inc.
Place of publication Hoboken, NJ
Publication date 2014-03
ISSN 0893-7524
2151-4658
Summary Objective
To comprehensively evaluate the performance of the Assessment of Quality of Life (AQoL) instrument for measuring health-related quality of life (HRQOL) in people with hip and knee joint disease (arthritis or osteoarthritis).

Methods

Data from 237 individuals were available for analysis from a national cross-sectional, population-based study of hip and knee joint disease in Australia. AQoL-4D data were evaluated using Rasch analysis. A range of measurement properties was explored, including model and item fit, threshold ordering, differential item functioning, and targeting.

Results
Good overall fit of the AQoL with the Rasch model was demonstrated across a range of tests, supporting internal validity. Only 1 item (relating to hearing) showed evidence of misfit. Most AQoL items showed logical sequencing of response option categories, with threshold disordering evident for only 2 of the 12 items (items 4 and 9). Minor issues with potential clinical and research implications include limited options for reporting pain and some evidence of measurement bias between demographic subgroups (including age and sex). Participants' HRQOL was generally better than that represented by the AQoL items (mean ± SD for person abilities −2.15 ± 1.39, mean ± SD for item difficulties 0.00 ± 0.67), indicating ceiling effects that could impact the instrument's ability to detect HRQOL improvement in population-based studies.

Conclusion
The AQoL is a competent tool for assessing HRQOL in people with hip and knee joint disease, although researchers and clinicians should consider the caveats identified when selecting appropriate HRQOL measures for future outcome assessment involving this patient group.
Language eng
DOI 10.1002/acr.22129
Field of Research 110322 Rheumatology and Arthritis
Socio Economic Objective 920408 Health Status (e.g. Indicators of Well-Being)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, John Wiley & Sons
Persistent URL http://hdl.handle.net/10536/DRO/DU:30061494

Document type: Journal Article
Collections: Faculty of Health
PVC's Office - Health
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Created: Mon, 10 Mar 2014, 14:39:07 EST by Lucy Busija

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