The aim of this study was to explore the reliability, validity, and responsiveness of the new Backache Index in patients with LBP. Patients with LBP filled in disability questionnaires; pain rating scales and physical impairment tests were completed in function of construct validity and correlation studies. A subgroup was evaluated for interobserver and test-retest reliability, and a second group was reassessed after two active treatment sessions to verify the responsiveness compared with other examined variables. The validity of the BAI was explored through a correlation with the standard Oswestry LBP Disability Index (ODI), the McGill LBP Questionnaire Index (MPQ), and the Visual Analogue Scale (VAS). The authors conclude that the BAI appears to be a reliable and valid assessment of overall restricted spinal movements in case of LBP and discriminates between successful and unsuccessful treatment outcome.
The Spine Journal, Volume 6, Issue 5, September-October 2006, Pages 565-571