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Scaling of the revised Oswestry low back pain questionnaire
Stephen J Page1, Marla A Shawaryn, Alison N Cernich
1Department of Physical Medicine and Rehabilitation, University of Cincinnati College of Medicine, 202 Goodman Drive, Suite 275, Cincinnati, OH 45267-0840, USA.
Objective:
To evaluate the measurement properties of the Revised Oswestry Disability Questionnaire (RODQ) by using rating scale analyses.
Design:
Calibration of item responses by using a data set.
Setting:
Four outpatient therapy clinics in the northeastern United States.
Patients:
Convenience sample of 95 community-dwelling adults exhibiting mild to severe low back pain-related disability (LBP-D).
Interventions:
Not applicable.
Main Outcome Measure:
The RODQ.
Results:
Several Rasch analyses were performed, with 1 item deleted and 2 response categories collapsed, creating a better test without increased error. A schema for item administration and evaluation was also developed.
Conclusions:
By using the abbreviated scale, suggested item order, and predicted responses, abbreviated versions of the instrument can be applied to measure LBP-D more efficiently.
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