title: Reliability, validity and responsiveness of the cross-culturally adapted Italian version of the core outcome measures index (COMI) for the neck.
abstract: OBJECTIVE
  Evaluation of the psychometric properties of a cross-culturally adapted questionnaire, the Core Outcome Measurement Index for neck pain (COMI-neck).
  
  
  METHODS
  The COMI-neck was cross-culturally adapted for the Italian language using established procedures. The following psychometric properties of the instrument were then assessed in patients with chronic neck pain undergoing rehabilitation: test-retest reliability (intraclass correlation coefficient, ICC); construct validity by comparing COMI-neck with the Neck Pain and Disability Scale, a numerical pain rating scale, and the EuroQol-Five Dimension (Pearson's correlations); and responsiveness by means of Standardized Response Mean (SRM), unpaired t tests, and Receiver Operating Characteristics (ROC) curves.
  
  
  RESULTS
  The questionnaire was completed by 103 subjects. The COMI-neck summary score displayed no relevant floor or ceiling effects. Test-retest reliability was excellent (ICC = 0.87). With one exception (symptom-specific well-being), the individual COMI items and the COMI summary score correlated to the expected extent with the scores of the reference questionnaires (r = 0.40-0.80). The mean change scores for the Italian COMI-neck differed significantly between patients with a good global outcome and those with a poor outcome (p = 0.002); SRM for the good outcome group was 1.23, and for the poor outcome group 0.40. ROC analysis revealed an area under the curve of 0.73 (95% CI: 0.62-0.85).
  
  
  CONCLUSIONS
  This study provides evidence that the Italian version of the COMI-neck is a valid and responsive questionnaire in the population of patients examined. Its use is recommended for clinical and research purposes.
authors.affiliation: Operative Unit of Physical Medicine and Rehabilitation, Scientific Institute of Lissone, Salvatore Maugeri Foundation, Institute of Care and Research (IRCCS), Via Monsignor Bernasconi, 16, 20035, Lissone (Milan), Italy, marco.monticone@fsm.it.
authors.forename: Marco
authors.initials: M
authors.lastname: Monticone
authors.forename: Simona
authors.initials: S
authors.lastname: Ferrante
authors.forename: Serena
authors.initials: S
authors.lastname: Maggioni
authors.forename: Gisel
authors.initials: G
authors.lastname: Grenat
authors.forename: Giovanni A
authors.initials: GA
authors.lastname: Checchia
authors.forename: Marco
authors.initials: M
authors.lastname: Testa
authors.forename: Marco G
authors.initials: MG
authors.lastname: Teli
authors.forename: Anne F
authors.initials: AF
authors.lastname: Mannion
mesh_terms: D000328:Adult; D000368:Aged; D059350:Chronic Pain / Q000175:diagnosis* / Q000534:rehabilitation; D003469:Culture; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D007558:Italy; D007802:Language; D008297:Male; D008875:Middle Aged; D019547:Neck Pain / Q000175:diagnosis* / Q000534:rehabilitation; D017063:Outcome Assessment, Health Care / Q000379:methods*; D010147:Pain Measurement / Q000379:methods*; D011594:Psychometrics; D012372:ROC Curve; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D055815:Young Adult