title: Thai Version of the Functional Rating Index for Patients with Back and Neck Pain: Part 1 Cross-Cultural Adaptation, Reliability and Validity.
abstract: OBJECTIVE
  To conduct the cross-cultural adaptation of the Functional Rating Index (FRI) and to test the reliability and validity of the Thai version of FRI (Thai FRI).
  
  
  METHODS
  The cross-cultural adaptation process was used to develop the Thai FRI. The two groups ofpatients comprised low back pain (LBP) and neckpain (NP). Each patient was asked to complete the questionnaires twice: at thefirst and second visits. The patients with LBP completed the Thai FRI, Roland-Morris Disability, modified Oswestry Low Back Pain Disability and multi-levelRoland-Morris Disability, while the patients with NP completed the Thai FRI and Thai Neck Disability Index. Each patient was also asked to rate a Global Perceived Effect Scale at the second visit. Reliability and cross- sectional construct validity of the Thai FRI were evaluated. Minimal detectable change (MDC95%) was calculated.
  
  
  RESULTS
  The FRI was cross-culturally adapted to Thai and the adapted version was validated. In total, 161 patients with LBP and 84 patients with NP completed the questionnaires. Cronbach ' alphafor the Thai FRI equaled 0.86 for LBP and 0.83 for NP, ICC(2,1) equaled 0.82 for LBP and 0.89 for NP correlations between the Thai FRI and other questionnaires ranged from 0.68 to 0.78 for both groups. The MDC(95%) equaled 2.5 for LBP and 2.3 for NP.
  
  
  CONCLUSIONS
  The Thai FRI was developed and validated. Its measurement properties demonstrated acceptable internal consistency, good test-retest reliability and moderate to high cross-sectional construct validity.
authors.forename: Wunpen
authors.initials: W
authors.lastname: Chansirinukor
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D006233:Persons with Disabilities; D005260:Female; D006801:Humans; D007802:Language; D017116:Low Back Pain / Q000175:diagnosis* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D019547:Neck Pain / Q000175:diagnosis* / Q000503:physiopathology; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D013785:Thailand; D055815:Young Adult