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Rheumatology (Oxford). 2015 Jan;54(1):64-71. doi: 10.1093/rheumatology/keu293. Epub 2014 Jul 26.

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

Author information

  • 1Statistics and Epidemiology, Division of Health Sciences, Warwick Medical School and Warwick Clinical Trials Unit, Division of Health Sciences, University of Warwick, Coventry, UK. h.parsons@warwick.ac.uk.
  • 2Statistics and Epidemiology, Division of Health Sciences, Warwick Medical School and Warwick Clinical Trials Unit, Division of Health Sciences, University of Warwick, Coventry, UK.

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.

© The Author 2014. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

KEYWORDS:

DRI; disability evaluation; patient reported outcomes; validity

PMID:
25065007
[PubMed - indexed for MEDLINE]
PMCID:
PMC4269794
[Available on 2016-01-01]
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