- Title
- Extension from inpatients to outpatients: validity and reliability of the Oxford Knee Score in measuring health outcomes in patients with knee osteoarthritis
- Creator
- Xie, Feng; Ye, Hua; Zhang, Yu; Liu, Xia; Lei, Ting; Li, Shu-Chuen
- Relation
- International Journal of Rheumatic Diseases Vol. 14, Issue 2, p. 206-210
- Publisher Link
- http://dx.doi.org/10.1111/j.1756-185X.2010.01580.x
- Publisher
- Wiley-Blackwell Publishing
- Resource Type
- journal article
- Date
- 2011
- Description
- Objective: To validate the Oxford Knee Score (OKS) in outpatients with knee osteoarthritis (OA). Methods: Eligible patients were interviewed using a pretested questionnaire containing the OKS, the Short Form (SF)-6D, and the EuroQol Group 5-Dimension Self-Report Questionnaire score (EQ-5D). Reliability was assessed using Cronbach’s alpha, dimensionality using principal component factor analysis and item-total correlations, convergent and discriminant construct validity using expected correlations between the OKS and the SF-6D and the EQ-5D. Results: The OKS were well accepted by patients in a pilot testing. When administered to a convenient sample of 187 patients with knee OA (mean age 64 years, 74% female, mean duration of OA 7.6 years), Cronbach’s alpha exceeded 0.8 and factor analysis yielded two factors with eigenvalues > 1. Hypothesized item-total correlations (ρ ≥ 0.4) were observed for all items. Convergent construct validity was supported by the presence of hypothesized moderate to strong correlations between the OKS and SF-6D physical functioning, role limitation, social functioning and pain, EQ-5D mobility, self-care, usual activities, and pain/discomfort, and mobility visual analogue scale (ρ = 0.47–0.82). Discriminant construct validity was not satisfactory. The OKS correlated weakly with SF-6D vitality (ρ = 0.35), but strongly with SF-6D mental health and EQ-5D anxiety/depression (ρ = 0.51 and 0.41, respectively). Conclusion: The OKS has demonstrated good psychometric properties and thus can be considered a reliable and valid measurement for outpatients with OA.
- Subject
- osteoarthritis; outpatient; quality of life; validity
- Identifier
- http://hdl.handle.net/1959.13/1065923
- Identifier
- uon:17959
- Identifier
- ISSN:1756-1841
- Language
- eng
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