Validation of the Mini-OAKHQOL for use in patients with osteoarthritis in Spain

Abstract

The Mini-Osteoarthritis Knee and Hip Quality of Life (Mini-OAKHQOL) questionnaire osteoarthritis is specific to individuals with knee or hip osteoarthritis. The objective of this study was to perform a validation of the Mini-OAKHQOL for use in Spain in terms of its psychometric properties of reliability, validity and responsiveness. Patients with osteoarthritis from the waiting list for a joint replacement completed the OAKHQOL, Short Form 36 Health Survey and Western Ontario and McMaster Universities Osteoarthritis Index. Reliability was assessed in terms of internal consistency and test-retest data, and convergent validity using Spearman’s correlation coefficient. Structural validity was investigated by confirmatory factor analysis, and Rasch analysis was used to examine the unidimensionality of the scales. Responsiveness was assessed by calculating effect sizes. Confirmatory factor analysis confirmed the five-factor model, and the results of the Rasch analyses supported the unidimensionality assumption, with infit and outfit statistics. Cronbach’s alpha ranged from 0.76 to 0.89 for all except the social dimensions. Statistically significant differences were observed between patients with different degrees of disease severity on all dimensions. There was convergent validity among dimensions expected to be correlated. The OAKHQOL questionnaire showed good responsiveness, with large changes for all dimensions apart from the two social dimensions, which had small effect sizes. Results of the study support the view that the Spanish version of the Mini-OAKHQOL questionnaire is a valid instrument to measure health-related quality of life in patients with osteoarthritis of the lower limb.

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Acknowledgments

We thank the staff members of the various services, research and quality units and medical record sections of the participating hospitals, and the patients who participated in the study, for their collaboration with this work.

Funding

This study was supported by a grant from the Spanish Health Research Fund (FIS PI06790351).

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Correspondence to Marta Gonzalez Sáenz de Tejada.

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The Institutional Review Boards of each hospital approved the study.

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Gonzalez Sáenz de Tejada, M., Bilbao, A., Herrera, C. et al. Validation of the Mini-OAKHQOL for use in patients with osteoarthritis in Spain. Clin Rheumatol 36, 1855–1864 (2017). https://doi.org/10.1007/s10067-017-3611-z

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Keywords

  • Health-related quality of life
  • Mini-OAKHQOL
  • Osteoarthritis
  • Validation