title: Measurement Properties of the Brazilian-Portuguese Version of the Lumbar Spine Instability Questionnaire.
abstract: METHODS
  Cross-cultural adaptation and analysis of measurement properties.
  
  
  OBJECTIVE
  To translate and cross-culturally adapt the Lumbar Spine Instability Questionnaire (LSIQ) into Brazilian-Portuguese and to test its measurement properties in Brazilian patients with low back pain.
  
  
  BACKGROUND
  The selection of subgroup of patients that respond better to specific interventions is the top research priority in the field of back pain. The LSIQ is a tool able to stratify patients with low back pain who responds better to motor control exercises. There is no Brazilian-Portuguese version of the LSIQ available.
  
  
  METHODS
  The original version of the LSIQ was translated and cross-culturally adapted. We collected data from 100 patients with low back pain. In addition to LSIQ, we also collected information about physical activity levels (measured by the International Physical Activity Questionnaire short version), disability (measured by the Roland Morris Disability Questionnaire), pain intensity (measured by the Pain numerical Rating Scale), kinesiophobia (measured by the Tampa Scale of Kinesiophobia), and depression (measured by the Beck Depression Inventory). The measurement properties tested were internal consistency, reproducibility (reliability and agreement), construct validity, and ceiling and floor effects.
  
  
  RESULTS
  The Brazilian-Portuguese version of the LSIQ showed good measurement properties with a Cronbach alpha of 0.79, an intraclass correlation coefficient of 0.75, a standard error of measurement of 1.65 points, and a minimal detectable change of 3.54 points. We did not detect ceiling and floor effects. The construct validity analysis was observed a moderate correlation between the LSIQ and Pain Numerical Rating Scale r = 0.46, Roland Morris Disability Questionnaire r = 0.66, Tampa Scale of Kinesiophobia r = 0.49, and Beck Depression Inventory r = 0.44.
  
  
  CONCLUSIONS
  The Brazilian-Portuguese version of LIQ has adequate measurement properties and can be used in clinical practice and research.
  
  
  METHODS
  NA.
authors.affiliation: Masters and Doctoral Programs in Physical Therapy, Universidade Cidade de São Paulo, São Paulo, Brazil.
authors.forename: Amanda Costa
authors.initials: AC
authors.lastname: Araujo
authors.affiliation: Masters and Doctoral Programs in Physical Therapy, Universidade Cidade de São Paulo, São Paulo, Brazil.|Musculoskeletal Division, The George Institute for Global Health, Sydney, Australia.
authors.forename: Lucíola
authors.initials: L
authors.lastname: da Cunha Menezes Costa
authors.affiliation: Department of Physical Therapy, Faculty of Science and Technology, Universidade Estadual Paulista, Presidente Prudente, São Paulo, Brazil.
authors.forename: Crystian Bittencourt Soares
authors.initials: CBS
authors.lastname: de Oliveira
authors.affiliation: Department of Physical Therapy, Faculty of Science and Technology, Universidade Estadual Paulista, Presidente Prudente, São Paulo, Brazil.
authors.forename: Priscila Kalil
authors.initials: PK
authors.lastname: Morelhão
authors.affiliation: Department of Physical Therapy, Faculty of Science and Technology, Universidade Estadual Paulista, Presidente Prudente, São Paulo, Brazil.
authors.forename: Rúben
authors.initials: R
authors.lastname: de Faria Negrão Filho
authors.affiliation: Department of Physical Therapy, Faculty of Science and Technology, Universidade Estadual Paulista, Presidente Prudente, São Paulo, Brazil.
authors.forename: Rafael Zambelli
authors.initials: RZ
authors.lastname: Pinto
authors.affiliation: Masters and Doctoral Programs in Physical Therapy, Universidade Cidade de São Paulo, São Paulo, Brazil.|Musculoskeletal Division, The George Institute for Global Health, Sydney, Australia.
authors.forename: Leonardo Oliveira Pena
authors.initials: LOP
authors.lastname: Costa
mesh_terms: D000328:Adult; D000368:Aged; D001938:Brazil / Q000208:ethnology; D003431:Cross-Cultural Comparison; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis* / Q000208:ethnology; D017116:Low Back Pain / Q000175:diagnosis* / Q000208:ethnology; D008159:Lumbar Vertebrae / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods / Q000592:standards*; D010865:Pilot Projects; D011795:Surveys and Questionnaires / Q000592:standards; D014175:Translating