| Title | Discriminant validity of the Western Ontario and McMaster Universities Osteoarthritis index physical functioning subscale in community samples with hip osteoarthritis. | | Author(s) | Pua YH, Cowan SM, Wrigley TV, Bennell KL | | Institution | Centre for Health, Exercise and Sports Medicine, School of Physiotherapy, University of Melbourne, Melbourne, Australia. puayonghao@gmail.com | | Source | Arch Phys Med Rehabil 2009 Oct; 90(10):1772-7. | | MeSH | Aged
Aged, 80 and over
Cross-Sectional Studies
Female
Humans
Male
Middle Aged
Osteoarthritis, Hip
Pain
Pain Measurement
Reproducibility of Results
| | Abstract | Pua Y-H, Cowan SM, Wrigley TV, Bennell KL. Discriminant validity of the Western Ontario and McMaster Universities Osteoarthritis Index Physical Functioning Subscale in community samples with hip osteoarthritis.
OBJECTIVE: To evaluate, in a community hip osteoarthritis (OA) sample, the discriminant validity of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) physical functioning (PF) subscale to differentiate between self-report measures of pain and physical function.
DESIGN: Cross-sectional.
SETTING: Human movement laboratory of a university.
PARTICIPANTS: Adults (N=100; 60 women, 40 men; age, 62.3+/-10.1y) with radiographically confirmed symptomatic hip OA.
INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURES: Six self-report measures of pain and physical function-WOMAC-PF and WOMAC-Pain subscales, Lower Extremity Functional Scale, Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36) bodily pain and PF subscales, and 4-item pain intensity measure-were obtained. Confirmatory factor analysis was applied to a correlated 2-factor measurement model that assumed discriminant validity: self-report measures of pain were conceptualized to load uniquely on 1 factor; self-report measures of physical function were conceptualized to load uniquely on the other factor.
RESULTS: Confirmatory factor analysis revealed that the initially proposed model did not achieve an acceptable fit to the data. Allowing a correlation between the error terms of the WOMAC-PF with those of the WOMAC-Pain and the SF-36 bodily pain subscales resulted in a viable model that provided adequate fit to the data (chi(2)=7.5, P=.28).
CONCLUSIONS: The findings suggest that the discriminant validity of the WOMAC-PF subscale from self-report pain measures cannot be confirmed in community-dwelling adults with hip OA. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 19801070 |
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