title: Responsiveness and minimum important change of the Oswestry Disability Index in Italian subjects with symptomatic lumbar spondylolisthesis.
abstract: BACKGROUND
  This study aims to investigate the responsiveness and the minimum important change of the Italian version of the Oswestry Disability Index (ODI-I) in subjects with symptomatic specific low back pain associated with lumbar spondylolisthesis (SPL).
  
  
  METHODS
  One hundred and fifty-one patients with symptomatic SPL completed the ODI-I, a 0-100 numerical rating scale (NRS), and performed the prone and supine bridge tests. The global perception of effectiveness was measured with a 7-point Likert scale. Responsiveness was assessed by distribution methods (minimum detectable change [MDC], effect size [ES], standardized response mean [SRM]) and anchor-based methods (ROC curves).
  
  
  RESULTS
  The MDC was 4.23, the ES was 0.95 and the SRM was 1.25. ROC analysis revealed an area under the curve of 0.76 indicating moderate discriminating capacity. The best cut-off point for the dichotomous outcome was 7.5 (sensitivity 90.3%, specificity 56.7%). .
  
  
  CONCLUSIONS
  The ODI-I proved to be responsive in detecting changes after conservative treatment in subjects with lumbar SPL.
  
  
  METHODS
  II.
authors.affiliation: Department of Molecular Medicine, University of Padova, Padua, Italy. carla.vanti@unibo.it.|, Via Tosarelli 144, Castenaso, 40055, Bologna, Italy. carla.vanti@unibo.it.
authors.forename: Carla
authors.initials: C
authors.lastname: Vanti
authors.affiliation: Department of Molecular Medicine, University of Padova, Padua, Italy.
authors.forename: Silvano
authors.initials: S
authors.lastname: Ferrari
authors.affiliation: IRCCS Don Gnocchi Foundation, Milan, Italy.
authors.forename: Jorge Hugo
authors.initials: JH
authors.lastname: Villafañe
authors.affiliation: IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Pedro
authors.initials: P
authors.lastname: Berjano
authors.affiliation: Department of Public Health, Clinic and Molecular Medicine, University of Cagliari, Cagliari, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Monticone
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D015994:Incidence; D007558:Italy / Q000453:epidemiology; D017116:Low Back Pain / Q000453:epidemiology / Q000209:etiology / Q000534:rehabilitation*; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods*; D011379:Prognosis; D012372:ROC Curve; D012720:Severity of Illness Index; D013168:Spondylolisthesis / Q000150:complications / Q000175:diagnosis / Q000534:rehabilitation*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Low back pain; Oswestry Disability Index; Outcome measures; Responsiveness; Spondylolisthesis