title: Reliability and Validity Testing of a Danish Translated Version of the Scoliosis Research Society Instrument-22 Revised (SRS-22R).
abstract: Cross-sectional Objectives: To present a reliable and valid Danish translation of the Scoliosis Research Society-22R (SRS-22R).
  
  
  
  The SRS22R was designed as a disease-specific measure of quality of life in surgically treated adolescent idiopathic scoliosis (AIS) patients. It has been translated and adapted into several languages. A reliable and valid Danish version is not available.
  
  
  
  A Danish version of the SRS-22R was developed using previously published and widely accepted guidelines. The final Danish SRS-22R and the Danish Short Form-36 were administered to 169 AIS patients and 45 healthy controls. Cronbach's α was computed as a measure of internal consistency. Concordant validity was determined by computing correlations of the SRS-22R Domains with the corresponding SF-36 domains and factor analysis. Discriminant validity was determined by comparing Domain scores between AIS patients treated surgically, AIS patients treated with a brace, and the healthy controls.
  
  
  
  One hundred sixty-five (97.6%) AIS patients and 42 (93.3%) healthy controls returned their questionnaires. Moderate ceiling effects were observed in the AIS cohort for the Function and Satisfaction Domains. Cronbach's α for each Domain and the Total score were good to excellent. Pearson correlation coefficients were found to be high for the SRS-22R Domains that had similar latent variables as the SF-36 Domains. Factor analysis revealed an underlying factorial structure of the questionnaire accounting for 60% of the explained variance. The SRS-22R Domain scores were statistically significantly different between the AIS cohort that had surgery, the AIS cohort that was treated with a brace, and the healthy controls.
  
  
  
  The Danish version of the SRS-22R is reliable, with content, concordant, and discriminant validity. The scores, the score distribution, and the ceiling and floor effects were similar to those of the original SRS-22R in English as well as other previous translations.
authors.affiliation: Center for Spine Surgery & Research, Middelfart Hospital, Ostre Hougvej 55, Middelfart 5500, Denmark. Electronic address: ane.simony1@rsyd.dk.
authors.forename: Ane
authors.initials: A
authors.lastname: Simony
authors.affiliation: Center for Spine Surgery & Research, Middelfart Hospital, Ostre Hougvej 55, Middelfart 5500, Denmark.
authors.forename: Leah Y
authors.initials: LY
authors.lastname: Carreon
authors.affiliation: Center for Spine Surgery & Research, Middelfart Hospital, Ostre Hougvej 55, Middelfart 5500, Denmark.
authors.forename: Mikkel O
authors.initials: MO
authors.lastname: Andersen
mesh_terms: D003430:Cross-Sectional Studies; D006801:Humans; D011788:Quality of Life; D015203:Reproducibility of Results; D012600:Scoliosis / Q000150:complications / Q000523:psychology; D011795:Surveys and Questionnaires
keywords: Adolescent idiopathic scoliosis; Outcomes; Reliability study; Scoliosis Research Society Questionaire 22R; Validation