Oswestry Disability Index (ODI) is a widely used spine-specific PRO instrument
in orthopedics to assess disability related to back pain and functional
improvement from treatment (Fairbank & Pynsent, 2000).
has 10 patient-completed questions in which the response options are presented
as 6-point Likert scales. Scores range from 0% (no disability) to 100% (most
For details, see Tang et al (under review), Linking Oswestry Disability Index to the PROMIS Pain Interference CAT with equipercentile methods