title: Cross-cultural adaptation and validation of the Portuguese version of the Living with Asthma Questionnaire.
abstract: OBJECTIVE
  To translate and culturally adapt the Living with Asthma Questionnaire (LWAQ) to the Portuguese language and to test its reliability and validity.
  
  
  METHODS
  The Portuguese version of this disease-specific health-related quality of life measure was obtained with forward/backward translations, consensus panels and a pre-test. The Portuguese LWAQ and Medical Outcomes Study - 36 item Short Form (SF-36) questionnaires, and a form for the characteristics of the patients were administered to 61 subjects with asthma.
  
  
  RESULTS
  Reliability of LWAQ scores was good with Cronbach's alpha coefficients ranging from 0.70 to 0.97 [with the exception of "preoccupation" (0.62) construct, and "sleep" (0.67) and "effects on others" (0.47) domains] and intraclass correlation coefficients between 0.86 and 0.99. Construct validity was supported by the confirmation of predefined hypotheses involving expected significant correlations between LWAQ total, constructs and domains, and SF-36 dimensions with similar content.
  
  
  CONCLUSIONS
  The Portuguese LWAQ exhibited suitable psychometric properties, in terms of internal consistency, reproducibility and construct validity.
authors: Escola Superior de Tecnologia da Saúde de Coimbra, Instituto Politécnico de Coimbra, Coimbra, Portugal. ruigoncalves@estescoimbra.pt
authors: R Soles
authors: RS
authors: Gonçalves
authors: L M
authors: LM
authors: Cavalheiro
authors: J Neves
authors: JN
authors: Gil
authors: A Lima
authors: AL
authors: Rodrigues
authors: A Pereira
authors: AP
authors: Coutinho
authors: G Alves
authors: GA
authors: Henriques
authors: P Lopes
authors: PL
authors: Ferreira
mesh_terms: D000328:Adult; D001249:Asthma / Q000175:diagnosis; D003466:Cultural Characteristics; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D011788:Quality of Life; D011795:Surveys and Questionnaires; D014177:Translations
keywords: Asma; Asthma; Health-related quality of life; Living with Asthma Questionnaire; Qualidade de vida relacionada com a saúde