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Measurement properties of the Disability Rating Index in patients undergoing hip replacement

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Parsons, Helen, Bruce, J. (Julie), Achten, Juul, Costa, Matthew L. and Parsons, Nicholas R. (2014) Measurement properties of the Disability Rating Index in patients undergoing hip replacement. Rheumatology, Volume 54 (Number 1). pp. 64-71. doi:10.1093/rheumatology/keu293 ISSN 1462-0324.

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Official URL: http://dx.doi.org/10.1093/rheumatology/keu293

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Abstract

Objective. The aim of this study was to establish and validate the measurement properties of the Disability Rating Index (DRI) in a population of adults undergoing hip replacement.

Methods. One hundred and twenty-six adults participating in a randomized controlled trial completed the Oxford Hip Score, Harris Hip Score, DRI and EuroQol Group–Five Dimensions (EQ-5D) questionnaires at four time points. The structural validity of the DRI was assessed using principal component analysis. Cronbach’s α was used to determine the internal consistency and scale reliability was also assessed. Correlation between the DRI and the other functional and health-related quality of life scales was used to check criterion validity. DRI responsiveness was estimated and the interpretability of the scale was also assessed by checking for edge effects.

Results. Results of analyses showed that the DRI was internally consistent (Cronbach’s α = 0.92), had good association with both function-specific and general health-related quality of life scores and was sensitive to change (smallest detectable change = 2.7). No evidence of edge effects was found. Furthermore, structural assessment of the DRI revealed two novel subscales representing simple tasks and difficult tasks.

Conclusions. The DRI is structurally valid, responsive and concurs with functional assessment in adults undergoing hip replacement.

Item Type: Journal Article
Subjects: R Medicine > RC Internal medicine
R Medicine > RD Surgery
Divisions: Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Clinical Trials Unit
Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences > Statistics and Epidemiology
Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School
Library of Congress Subject Headings (LCSH): Disability assessment , Total hip replacement -- Patients, Clinical trials
Journal or Publication Title: Rheumatology
Publisher: Oxford University Press
ISSN: 1462-0324
Official Date: 26 July 2014
Dates:
DateEvent
26 July 2014Available
30 May 2014Accepted
2 December 2013Submitted
Volume: Volume 54
Number: Number 1
Page Range: pp. 64-71
DOI: 10.1093/rheumatology/keu293
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 27 December 2015
Date of first compliant Open Access: 27 December 2015
Adapted As: Submitted 2 December 2013 revised version accepted 30 May 2014

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