1. The Oswestry disability index revisited: its reliability, repeatability and validity, and a comparison with the St. Thomas's disability index;Baker,1989
2. Measuring the functional status of patients with low back pain. Assessment of the quality of four disease specific questionnaires;Beurskens;Spine,1995
3. The efficacy of traction for lumbar back pain. Design of a randomized clinical trial;Beurskens;J. Manipulative Physiol. Ther.,1995
4. Preference for endpoint measures in clinical trials: results of structured workshops;Bombardier;J. Rheumatol.,1982
5. The relationship between the St. Thomas and Oswestry disability scores and the severity of low back pain;Co;J. Manipulative Physiol. Ther.,1993