1. The use of Rasch measurement to improve the Oswestry classification scheme 
Louise J. White, PhD, PT, Craig A. Velozo, PhD, OTR 
Archives of Physical Medicine and Rehabilitation 
Volume 83, Issue 6, Pages (June 2002)
DOI: /apmr
Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

2. Fig. 1
The relationship between subject ability and item difficulty level for the Oswestry scale. The responses depicted are all 4 categories for each item. The linear categories of disability are differentiated to show items responses that describe each category. Legend: Q, 2 SDs from mean; S, 1 SD from mean; M, mean measure; inc, increased.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /apmr )
Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

3. Fig. 2
Keyform: self-scoring, self-measuring method using the Oswestry items for individual subject assessment based on the results of the Rasch scaling. To use, circle the subject's responses. Often a majority of the responses will fall within a shaded area. If 1 or 2 item responses deviate more than 1 response level from the rest of the other responses, those items may be important for further investigation. Drawing a vertical line at a point midway between the majority of responses shows the subject's relative position. Legend: Δ, patient 238; ○, patient 822.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /apmr )
Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions