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Measurement precision of the disability for back pain scale-by applying Rasch analysis.

Authors :
Yen-Mou Lu
Yuh-Yih Wu
Ching-Lin Hsieh
Chih-Lung Lin
Shiuh-Lin Hwang
Kuang-I Cheng
Yi-Jing Lue
Source :
Health & Quality of Life Outcomes. 2013, Vol. 11 Issue 1, p1-10. 10p.
Publication Year :
2013

Abstract

Background: The Oswestry Disability Index (ODI) is widely used for patients with back pain. However, few studies have examined its psychometric properties using modern measurement theory. The purpose of this study was to investigate the psychometric properties of the ODI in patients with back pain using Rasch analysis. Methods: A total of 408 patients with back pain participated in this cross-sectional study. Patients were recruited from the orthopedic, neurosurgery, rehabilitation departments and pain clinic of two hospitals. Rasch analysis was used to examine the Chinese version of ODI 2.1 for unidimensionality, item difficulty, category function, differential item functioning, and test information. Results: The fit statistics showed 10 items of the ODI fitted the model's expectation as a unidimensional scale. The ODI measured the different levels of functional limitation without skewing toward the lower or higher levels of disability. No significant ceiling and floor effects and gaps among the items were found. The reliability was high and the test information curve demonstrated precise dysfunction estimation. Conclusions: Our results showed that the ODI is a unidimensional questionnaire with high reliability. The ODI can precisely estimate the level of dysfunction, and the item difficulty of the ODI matches the person ability. For clinical application, using logits scores could precisely represent the disability level, and using the item difficulty could help clinicians design progressive programs for patients with back pain. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14777525
Volume :
11
Issue :
1
Database :
Academic Search Index
Journal :
Health & Quality of Life Outcomes
Publication Type :
Academic Journal
Accession number :
89638778
Full Text :
https://doi.org/10.1186/1477-7525-11-119