title: Psychometric properties of the Swedish version of the Treatment Outcome Satisfaction Questionnaire.
abstract: Patient satisfaction is an outcome measure for low-back pain (LBP) interventions which allows clinicians to design patient-oriented treatments. The Treatment Outcome Satisfaction Questionnaire (TOSQ) is an English instrument constructed for such evaluations, and no equivalent instruments exist for the Swedish population. This study, therefore, translated TOSQ into Swedish and assessed the translated version's psychometric properties for patients with LBP.
  
  
  
  A cross-cultural adaptation was used to translate TOSQ into Swedish. Subsequently, data from 131 patients with LBP whom undergone physiotherapy were consecutively aggregated and analyzed in a Rasch rating scale model with person measures standardized at 0-100 logits to evaluate the translated scale's validity. Finally, test-retest reliability of the Swedish version of TOSQ (TOSQ-S) was quantified via an intraclass correlation coefficient (ICC) and the standard error of measurement (SEM) in 41 patients.
  
  
  
  TOSQ was successfully translated into Swedish; however, while some Rasch model indices supported the translated scale's unidimensionality, one out of eight items and 12 out of 131 subjects misfitted the model. Scale optimization resulted in a 6-item subconfiguration, for which all items fitted the model, person misfits were reduced to ten subjects, and the person separation index increased from 1.86 to 2.04. ICC and SEM estimates suggested acceptable reliability for the six-item TOSQ-S at 0.66 and 6.6 logits, respectively.
  
  
  
  A six-item TOSQ-S configuration showed acceptable psychometric properties and is suitable for measuring treatment outcome satisfaction of physiotherapy in patients with LBP.
authors.affiliation: Division of Physiotherapy, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Alfred Nobels allé 23, Huddinge, 141 83, Sweden. lomartire@kth.se.|Centre for Naval Architecture, Department of Aeronautical and Vehicle Engineering, KTH Royal Institute of Technology, Teknikringen 8, Stockholm, 100 44, Sweden. lomartire@kth.se.
authors.forename: Riccardo
authors.identifier: 0000-0003-0672-8214
authors.initials: R
authors.lastname: Lo Martire
authors.affiliation: Occupational and Industrial Orthopaedic Center (OIOC), Hospital for Joint Diseases, New York University Langone Medical Center, 63 Downing Street, New York, 100 14, NY, USA.|Department of Physical Therapy, Seton Hall University, 400 South Orange Ave, South Orange, 070 89, NJ, USA.
authors.forename: Angela
authors.initials: A
authors.lastname: Lis
authors.affiliation: Musculoskeletal & Sports Injury Epidemiology Center, Institute of Environmental Medicine, Karolinska Institutet, Box 210, Stockholm, 171 77, Sweden.
authors.forename: Eva
authors.initials: E
authors.lastname: Skillgate
authors.affiliation: Division of Physiotherapy, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Alfred Nobels allé 23, Huddinge, 141 83, Sweden.|Musculoskeletal & Sports Injury Epidemiology Center, Institute of Environmental Medicine, Karolinska Institutet, Box 210, Stockholm, 171 77, Sweden.
authors.forename: Eva
authors.identifier: 0000-0003-3015-1232
authors.initials: E
authors.lastname: Rasmussen-Barr
mesh_terms: D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000534:rehabilitation*; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D026741:Physical Therapy Modalities; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D013548:Sweden; D014175:Translating
keywords: Low-back pain; Physiotherapy; Rasch analysis; Reliability; Validity