[논문]The Visual Analogue WOMAC 3.0 scale - internal validity and responsiveness of the VAS version

Kersten, Paula; White, Peter J; Tennant, Alan

doi:10.1186/1471-2474-11-80

[해외논문] The Visual Analogue WOMAC 3.0 scale - internal validity and responsiveness of the VAS version 원문보기

BMC musculoskeletal disorders, v.11, 2010년, pp.80 - 80

Kersten, Paula (School of Health Sciences, University of Southampton, Highfield, Southampton, UK) , White, Peter J (School of Health Sciences, University of Southampton, Highfield, Southampton, UK) , Tennant, Alan (Department of Rehabilitation Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, UK)

Abstract ▼ AI-Helper

BackgroundMany people suffer with Osteoarthritis (OA) and subsequent morbidity. Therefore, measuring outcome associated with OA is important. The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) has been a widely used patient reported outcome in OA. However, there is relatively little evidence to support the use of the Visual Analogue Scale (VAS) version of the scale. We aimed to explore the internal validity and responsiveness of this VAS version of the WOMAC.MethodsPatients with chronic hip or knee pain of mechanical origin, waiting for a hip or knee joint replacement completed the WOMAC as part of a study to investigate the effects of acupuncture and placebo controls. Validity was tested using factor analysis and Rasch analysis, and responsiveness using standardised response means.ResultsTwo hundred and twenty one patients (mean age 66.8, SD 8.29, 58% female) were recruited. Factor and Rasch analysis confirmed unidimensional Pain and Physical Functioning scales, capable of transformation to interval scaling and invariant over time. Some Differential Item Functioning (DIF) was observed, but this cancelled out at the test level. The Stiffness scale fitted the Rasch model but adjustments for DIF could not be made due to the shortness of the scale. Using the interval transformed data, Standardised Response Means were smaller than when using the raw, ordinal data.ConclusionsThe WOMAC Pain and Physical Functioning subscales satisfied unidimensionality and ordinal scaling tests, and the ability to transform to an interval scale. Some Differential Item Functioning was observed, but this cancelled out at the test level and, by doing so, at the same time removed the disturbance of unidimensionality. The scaling characteristics of sets of items which use VAS require further analysis, as it would appear that they can lead to spurious levels of responsiveness and scale compression because they exaggerate the distortion of the ordinal scale.Trial numberUKCRN study ID: 4881ISRCTN78434638

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[해외논문] The Visual Analogue WOMAC 3.0 scale - internal validity and responsiveness of the VAS version 원문보기

Abstract ▼ AI-Helper

참고문헌 (54)

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