title: Back Performance Scale for the assessment of mobility-related activities in people with back pain.
abstract: OBJECTIVE
  Activities that require mobility of the trunk are often limited in patients with back problems. For this study, 5 tests (Sock Test, Pick-up Test, Roll-up Test, Fingertip-to-Floor Test, and Lift Test), all requiring sagittal-plane mobility, were performed, and the test scores were combined by the authors in a scale called the Back Performance Scale (BPS) to obtain a performance measure of mobility-related activities.
  
  
  METHODS
  The participants were 288 patients with long-lasting musculoskeletal pain.
  
  
  METHODS
  The basis for constructing a sum scale (BPS), discriminative ability, and responsiveness to important change of the BPS were examined in patients with back pain.
  
  
  RESULTS
  Bivariate correlations (rs) of scores among tests ranged from.27 to.50, and correlations between separate tests and the BPS ranged from.63 to.73. The Cronbach alpha was.73. The BPS sum scores discriminated between patients with different return to work status and were higher for back pain than for other musculoskeletal pain. Responsiveness was high (effect size=1.33) in patients who had changed and low (effect size=0.31) in patients who had not changed, using return to work as an external indicator of important change. The BPS was more responsive than the separate tests.
  
  
  CONCLUSIONS
  The BPS appears to measure an aspect of physical performance that is of clinical importance to patients with back pain.
authors.affiliation: Section of Physiotherapy Science, Department of Public Health and Primary Health Care, Faculty of Medicine, University of Bergen, Ulriksdal 8c, Bergen, Norway. liv.strand@isf.uib.no
authors.forename: Liv Inger
authors.initials: LI
authors.lastname: Strand
authors.forename: Rolf
authors.initials: R
authors.lastname: Moe-Nilssen
authors.forename: Anne Elisabeth
authors.initials: AE
authors.lastname: Ljunggren
mesh_terms: D000328:Adult; D001416:Back Pain / Q000503:physiopathology / Q000534:rehabilitation*; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D013647:Task Performance and Analysis