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Extension from inpatients to outpatients: validity and reliability of the Oxford Knee Score in measuring health outcomes in patients with knee osteoarthritis.
Int J Rheum Dis. 2011 May; 14(2):206-10.IJ

Abstract

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.

Authors+Show Affiliations

Department of Clinical Epidemiology and Biostatistics, McMaster University, ON, Canada. fengxie@mcmaster.caNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Validation Study

Language

eng

PubMed ID

21518321

Citation

Xie, Feng, et al. "Extension From Inpatients to Outpatients: Validity and Reliability of the Oxford Knee Score in Measuring Health Outcomes in Patients With Knee Osteoarthritis." International Journal of Rheumatic Diseases, vol. 14, no. 2, 2011, pp. 206-10.
Xie F, Ye H, Zhang Y, et al. Extension from inpatients to outpatients: validity and reliability of the Oxford Knee Score in measuring health outcomes in patients with knee osteoarthritis. Int J Rheum Dis. 2011;14(2):206-10.
Xie, F., Ye, H., Zhang, Y., Liu, X., Lei, T., & Li, S. C. (2011). Extension from inpatients to outpatients: validity and reliability of the Oxford Knee Score in measuring health outcomes in patients with knee osteoarthritis. International Journal of Rheumatic Diseases, 14(2), 206-10. https://doi.org/10.1111/j.1756-185X.2010.01580.x
Xie F, et al. Extension From Inpatients to Outpatients: Validity and Reliability of the Oxford Knee Score in Measuring Health Outcomes in Patients With Knee Osteoarthritis. Int J Rheum Dis. 2011;14(2):206-10. PubMed PMID: 21518321.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Extension from inpatients to outpatients: validity and reliability of the Oxford Knee Score in measuring health outcomes in patients with knee osteoarthritis. AU - Xie,Feng, AU - Ye,Hua, AU - Zhang,Yu, AU - Liu,Xia, AU - Lei,Ting, AU - Li,Shu-Chuen, Y1 - 2010/11/02/ PY - 2011/4/27/entrez PY - 2011/4/27/pubmed PY - 2011/8/17/medline SP - 206 EP - 10 JF - International journal of rheumatic diseases JO - Int J Rheum Dis VL - 14 IS - 2 N2 - 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. SN - 1756-185X UR - https://www.unboundmedicine.com/medline/citation/21518321/Extension_from_inpatients_to_outpatients:_validity_and_reliability_of_the_Oxford_Knee_Score_in_measuring_health_outcomes_in_patients_with_knee_osteoarthritis_ L2 - https://doi.org/10.1111/j.1756-185X.2010.01580.x DB - PRIME DP - Unbound Medicine ER -