Validity and reliability of English and Marathi Oswestry Disability Index (version 2.1a) in Indian population.

Study Design: A total of 200 patients with low back pain (LBP) completed an English and Marathi Oswestry Disability Index (ODI) questionnaires (100 each), visual analogue scale, and Roland-Morris Disability Questionnaire.

Objective: To validate the English and Marathi versions of ODI (version 2.1a).