title: [Portuguese-language version of the Asthma Control Test].
abstract: OBJECTIVE
  To develop and validate a Portuguese-language version of the Asthma Control Test (ACT) for use in Brazil.
  
  
  METHODS
  The study comprised 290 asthma outpatients over 12 years of age. The patients completed the ACT questionnaire and had an appointment with a pulmonologist in order to assess asthma control in two visits. In the first visit, the patients also underwent spirometry. The second visit took place at least four weeks later.
  
  
  RESULTS
  We found that a cut-off score of 18 points-to differentiate between subjects with controlled asthma and those with uncontrolled asthma-had a sensitivity of 93%, a specificity of 74%, a negative predictive value of 86% and a positive predictive value of 85%. The positive and negative likelihood ratios were 3.58 and 0.09, respectively. The questionnaire has an outstanding capacity to differentiate uncontrolled asthma from controlled asthma, with an area under the ROC curve of 0.904. The patients whose symptoms remained stable between the two visits had similar scores, demonstrating good test-retest reproducibility, with an intraclass correlation coefficient of 0.93. The patients whose symptoms improved in the second visit had significantly higher scores, demonstrating good responsiveness of the questionnaire in the identification of changes in disease control.
  
  
  CONCLUSIONS
  The Portuguese-language version of the ACT showed good test-retest reproducibility and was capable of discriminating the levels of asthma control and detecting changes in asthma control in a population of patients with a low level of education and low family income at a public health facility in Brazil.
authors.affiliation: Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil. jaque_pfaria@hotmail.com
authors.forename: Jaqueline Petroni Faria
authors.initials: JP
authors.lastname: Roxo
authors.forename: Eduardo Vieira
authors.initials: EV
authors.lastname: Ponte
authors.forename: Daniela Campos Borges
authors.initials: DC
authors.lastname: Ramos
authors.forename: Luciana
authors.initials: L
authors.lastname: Pimentel
authors.forename: Argemiro
authors.initials: A
authors.lastname: D'Oliveira Júnior
authors.forename: Alvaro Augusto
authors.initials: AA
authors.lastname: Cruz
mesh_terms: D000328:Adult; D001249:Asthma / Q000175:diagnosis / Q000517:prevention & control* / Q000628:therapy; D001938:Brazil; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D015980:Public Health Practice; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating