title: Validity and reliability of an adapted Thai version of Scoliosis Research Society-22 questionnaire for adolescent idiopathic scoliosis.
abstract: METHODS
  Cross-sectional observational study to investigate psychometric properties of an adapted Thai version of the refined Scoliosis Research Society-22 (SRS-22) questionnaire.
  
  
  OBJECTIVE
  To evaluate the reliability and validity of the adapted Thai version of the refined SRS-22 questionnaire.
  
  
  BACKGROUND
  The SRS-22 questionnaire is a valid instrument for assessing the health-related quality of life for patients with adolescent idiopathic scoliosis. Recently, the questionnaire has been translated and validated in many languages for non-English-speaking countries.
  
  
  METHODS
  Translation/retranslation of the English version of the SRS-22 was conducted, and the cross-cultural adaptation process was performed. The Thai version SRS-22 and previously validated Thai version Short-Form survey version 2.0 (SF-36V2) questionnaires were administered to 77 patients with adolescent idiopathic scoliosis who had surgical treatment. Fifty-eight patients (52 adolescent girls) had filled out the first set of questionnaires. Thirty patients of the first-time responders completed the second set of questionnaires. The mean age at the time of operation was 14.6 years and the mean age at the time of the final follow-up was 18.7 years. The mean preoperative scoliosis curve magnitude was 55.4° (range, 30°-95°) and postoperative curve magnitude was 20.1° (range, 0°-60°). Internal consistency was determined with Cronbach α coefficient. Intraclass correlation coefficient was used for test-retest reliability. Concurrent validity was evaluated by comparing SRS-22 domains with relevant domains in the SF-36V2 questionnaire, using the Pearson correlation coefficient.
  
  
  RESULTS
  The mean overall Cronbach α coefficient of the adapted Thai version SRS-22 was 0.76. The 2 of corresponding domains (mental health = 0.80 and self-image = 0.83) had satisfactory internal consistency and the remaining domains (pain = 0.78; function/activity = 0.74; and satisfaction = 0.76) were good. The intraclass correlation coefficient for 5 domains was ranged from 0.79 to 0.90, which demonstrated the satisfactory test/retest reproducibility. The concurrent validity, determined by the Pearson correlation coefficient between SRS-22 and SF-36V2 domains, had a good correlation for 15 relevant comparisons (r = 0.50-0.75).
  
  
  CONCLUSIONS
  The adapted Thai version of the SRS-22 questionnaire had validity and reliability, which can be used to assess the outcome of treatment among Thai-speaking patients with adolescent idiopathic scoliosis.
authors.affiliation: Spine Unit, Institute of Orthopedics, Lerdsin General Hospital, Bangkok, Thailand.
authors.forename: Vera
authors.initials: V
authors.lastname: Sathira-Angkura
authors.forename: Kongkit
authors.initials: K
authors.lastname: Pithankuakul
authors.forename: Susana
authors.initials: S
authors.lastname: Sakulpipatana
authors.forename: Chaiwat
authors.initials: C
authors.lastname: Piyaskulkaew
authors.forename: Sombat
authors.initials: S
authors.lastname: Kunakornsawat
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000367:Age Factors; D044466:Asian People / Q000523:psychology; D002648:Child; D003430:Cross-Sectional Studies; D003466:Cultural Characteristics; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008603:Mental Health; D010147:Pain Measurement; D017060:Patient Satisfaction; D011237:Predictive Value of Tests; D011594:Psychometrics; D011788:Quality of Life; D011859:Radiography; D020127:Recovery of Function; D015203:Reproducibility of Results; D012600:Scoliosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000208:ethnology / Q000503:physiopathology / Q000523:psychology / Q000601:surgery; D012649:Self Concept; D012720:Severity of Illness Index; D012955:Societies, Medical; D011795:Surveys and Questionnaires; D013785:Thailand / Q000453:epidemiology