title: Reliability and validity of the Persian adaptation of the Core Outcome Measure Index in patients with chronic low back pain.
abstract: BACKGROUND
  The purpose of the study was to determine whether the Persian Core Outcome Measures Index (PCOMI) is reliable and valid in patients with chronic low back pain (CLBP).
  
  
  METHODS
  The Persian COMI was developed using forward-backward translational method. Subjects were100 patients with CLBP. Patients completed the PCOMI, Persian functional rating index, and visual analog scale. Fifty patients completed the PCOMI for the second time after 7days to evaluate test-retest reliability. Fifty healthy subjects participated to assess discriminant validity.
  
  
  RESULTS
  There was no ceiling or floor effect. Cronbach's alpha was 0.85. The construct validity coefficient was 0.72. The ICCagreementfor test-retest reliability was 0.86. Pearson correlation for criterion validity was 0.70. The PCOMI discriminated between patients and healthy subjects. The standard error of measurement and the smallest detectable change was 0.75 and 2.1, respectively. Factor analysis extracted 1 component.
  
  
  CONCLUSIONS
  The results support the reliability and validity of the PCOMI for assessing patients with CLBP.
authors.affiliation: Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: nakhostin@sina.tums.ac.ir.
authors.forename: Noureddin
authors.initials: N
authors.lastname: Nakhostin Ansari
authors.affiliation: Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Soofia
authors.initials: S
authors.lastname: Naghdi
authors.affiliation: Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Eskandari
authors.affiliation: Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nasser
authors.initials: N
authors.lastname: Salsabili
authors.affiliation: Sports Medicine Research Centre, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ramin
authors.initials: R
authors.lastname: Kordi
authors.affiliation: Department of Physical Therapy, Georgia Regents University, Augusta, GA, USA.
authors.forename: Scott
authors.initials: S
authors.lastname: Hasson
mesh_terms: D000328:Adult; D059350:Chronic Pain / Q000175:diagnosis* / Q000628:therapy; D003431:Cross-Cultural Comparison; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D007492:Iran; D017116:Low Back Pain / Q000175:diagnosis* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D010147:Pain Measurement; D011594:Psychometrics; D011795:Surveys and Questionnaires; D014177:Translations; D014481:United States