title: Portuguese validation of the Rome III diagnostic questionnaire for functional dyspepsia.
abstract: BACKGROUND
  Validated questionnaires are essential tools to be utilized in epidemiological research. At the moment there are no Rome III diagnostic questionnaires translated to Portuguese.
  
  
  OBJECTIVE
  To validate the Portuguese version of the Rome III Diagnostic Questionnaire for Functional Dyspepsia.
  
  
  METHODS
  The questionnaire has been translated following the Rome III recommendations. Hundred and nine consecutive patients with functional dyspepsia answered the questionnaire. The control group comprised 100 healthy consecutive blood donors, without digestive problems. Internal consistency, reproducibility, responsiveness, discriminate validity and content analysis were evaluated.
  
  
  RESULTS
  Cronbach's α coefficient was 0.92. The questionnaire showed reliability: the patients answered it in a similar way on two distinct occasions and their responses were substantially very similar (P = 1.00). The questionnaire was able to demonstrate changes when they occur (P<0.01). Two "blinded" gastroenterologists agreed that the questionnaire adequately evaluated Functional Dyspepsia. When we compared the answers between patients and controls, the questionnaire showed that 5.3% of controls had Functional Dyspepsia symptoms compared with 91.2% of the patients (P<0.01).
  
  
  CONCLUSIONS
  The Rome III Diagnostic Questionnaire for Functional Dyspepsia is ready to be used in clinical researches in lusophone countries, as it has been successfully validated in Portuguese.
authors.affiliation: Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil. pamela_svr@hotmail.com
authors.forename: Pâmela Schitz Von
authors.initials: PS
authors.lastname: Reisswitz
authors.forename: Luiz Edmundo
authors.initials: LE
authors.lastname: Mazzoleni
authors.forename: Guilherme Becker
authors.initials: GB
authors.lastname: Sander
authors.forename: Carlos Fernando de Magalhães
authors.initials: CF
authors.lastname: Francisconi
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil; D002986:Clinical Trials as Topic; D004415:Dyspepsia / Q000175:diagnosis*; D005260:Female; D005767:Gastrointestinal Diseases / Q000145:classification / Q000175:diagnosis*; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014177:Translations; D055815:Young Adult