Supplemental PowerPoint Slides The Oswestry Disability Index (version 2.1a): Validation of a Dutch language version M.L. van Hooff MSc1; M. Spruit MD PhD2; J.C.T. Fairbank MA MD FRCS3; J. van Limbeek MD PhD4; W.C.H. Jacobs PhD5 1. Sint Maartenskliniek, Dept. Research, P.O. Box 9011, 6500 GM Nijmegen, The Netherlands 2. Sint Maartenskliniek, Dept. Orthopedics, P.O. Box 9011, 6500 GM Nijmegen, The Netherlands 3. Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Science, University of Oxford, Nuffield Orthopaedic Centre, Windmill Road, Oxford OX3 7HE, United Kingdom 4. Achmea Health Insurance Company, P.O. Box 866, 3700 AW Zeist, The Netherlands 5. Leiden University Medical Center, Dept. Neurosurgery, P.O. Box 9600, 2300 RC Leiden, The Netherlands Copyright © 2015 Lippincott Williams & Wilkins. Unauthorized commercial reproduction of this slide is prohibited

Key points The Dutch version of ODI 2.1a is a valid and valuable tool to measure functional outcome in spine care. Factor analysis suggested a one-factor structure. The Dutch ODI showed a strong correlation with the NRS pain severity as well as the Dutch RMDQ and the physical component of SF-36. The Dutch ODI is recommended as a condition-specific PROM for use in future Dutch back pain research and to evaluate outcome of back care. The Dutch ODI is implemented in the Dutch Spine Surgery Registry for the spine society in the Netherlands.

Bland and Altman plot. Differences between ODI and RMDQ in patients with CLBP.