title: Reproducibility of the Brazilian Portuguese version of the European Organization for Research and Treatment of Cancer Core Quality of Life Questionnaire used in conjunction with its lung cancer-specific module.
abstract: OBJECTIVE
  The assessment of the quality of life in patients with lung cancer has become one of the main goals in current clinical trials. To assess the quality of life of these patients, the most widely used instrument is the 30-item European Organization for Research and Treatment of Cancer Core Quality of Life Questionnaire (EORTC QLQ-C30) in conjunction with its supplemental 13-item lung cancer-specific module (QLQ-LC13). The objective of this study was to assess the reproducibility of the Brazilian Portuguese version of these questionnaires.
  
  
  METHODS
  A prospective study involving 30 stable outpatients with lung cancer who completed the instruments on the first day of the study and two weeks later.
  
  
  RESULTS
  The test-retest reproducibility using the intraclass correlation coefficient for the EORTC QLQ-C30 and the QLQ-LC13 ranged from 0.64 to 1.00 and from 0.64 to 0.95, respectively. No correlations were found between the domains of the instruments and clinical parameters.
  
  
  CONCLUSIONS
  Our findings show that these instruments were reproducible in this sample of patients with lung cancer in Brazil.
authors.affiliation: Pulmonology/Oncology Outpatient Clinic, Federal University of São Paulo/Paulista School of Medicine, São Paulo, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Franceschini
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Jardim
authors.forename: Ana Luisa Godoy
authors.initials: AL
authors.lastname: Fernandes
authors.forename: Sérgio
authors.initials: S
authors.lastname: Jamnik
authors.forename: Ilka Lopes
authors.initials: IL
authors.lastname: Santoro
mesh_terms: D001938:Brazil; D003466:Cultural Characteristics; D005260:Female; D006801:Humans; D007802:Language; D008175:Lung Neoplasms / Q000523:psychology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating