Item response theory analysis of the modified Roland-Morris Disability Questionnaire in a population-based study

Spine
Thelma J MielenzMichael C Edwards

Abstract

This is a secondary analysis of a cross-sectional population-based survey. Shorten the modified 23-item Roland (mRoland) scale using item response theory (IRT) methods and describe where in the functional disability range each scale is the most precise. The Roland-Morris Disability Questionnaire is recommended for a functional disability outcome measure in patients with low back pain (LBP). One commonly used version is the Roland. It is unknown where in the functional disability range the Roland measures. One candidate individual with LBP in randomly selected households was interviewed, identifying 694 adults with chronic LBP. To justify the use of a unidimensional 2-parameter logistic IRT model, we performed both exploratory and confirmatory factor analysis. Exploratory factor analysis revealed one dominant eigenvalue. Confirmatory factor analysis results indicate that the 1-factor model fit well. IRT analysis revealed variability in the slopes, in the range from 1.07 to 3.10. The marginal reliability, an IRT-based analog to coefficient α, was 0.88. The mRoland produces reliable scores (i.e., with a standard error <0.3) from 1.4 standard deviations below the mean to roughly 0.2 above the mean. The mRoland measures one construc...Continue Reading

References

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May 15, 2007·Spine·Timothy S Carey, Thelma J Mielenz
Feb 11, 2009·Archives of Internal Medicine·Janet K FreburgerTimothy S Carey

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Citations

Nov 26, 2016·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Tiê Parma YamatoJames H McAuley

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