title: Cross-cultural adaptation of The Beliefs about Medicines Questionnaire into Portuguese.
abstract: OBJECTIVE
  The Beliefs about Medicines Questionnaire (BMQ-Specific) has proven useful for measuring patients' beliefs and associating them with non-adherence to treatment in several illness groups. The aim was to cross-culturally adapt the BMQ-Specific into Portuguese for the general population of medicine users.
  
  
  METHODS
  Cross-sectional study conducted among users of public hospitals and outpatient clinics in Guarda and Covilhã, Portugal.
  
  
  METHODS
  The BMQ-Specific was translated using international recommendations for performing cross-cultural adaptation and was administered to 300 patients. An initial principal component analysis (PCA) was conducted with the extraction criterion of eigenvalue > 1.0, followed by a second PCA with restriction to two components. Reliability was assessed by calculating Cronbach's alpha coefficient.
  
  
  RESULTS
  The mean scores obtained for the Necessity and Concerns subscales of the Portuguese BMQ-Specific were 19.9 (standard deviation, SD = 2.8) (range 10 to 25) and 17.7 (SD = 3.9) (range 6 to 30), respectively. The first PCA produced an unstable three-component structure for the Portuguese BMQ-Specific. The final PCA solution yielded a two-component structure identical to the original English version (a five-item Necessity and a six-item Concerns subscale), and explained 44% of the variance. Cronbach's alpha for the complete Portuguese BMQ-Specific was 0.70, and 0.76 and 0.67 for the Necessity and Concerns subscales, respectively.
  
  
  CONCLUSIONS
  A cross-culturally adapted Portuguese version of the BMQ-Specific questionnaire for use among the general population of medicine users was obtained, presenting good internal consistency and component structure identical to the original English version.
authors: Research Institute for Medicines and Pharmaceutical Sciences iMed. UL, Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal.
authors: Teresa
authors: T
authors: Salgado
authors: Alexandra
authors: A
authors: Marques
authors: Leonor
authors: L
authors: Geraldes
authors: Shalom
authors: S
authors: Benrimoj
authors: Robert
authors: R
authors: Horne
authors: Fernando
authors: F
authors: Fernandez-Llimos
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D007802:Language; D008297:Male; D055118:Medication Adherence / Q000523:psychology*; D008875:Middle Aged; D025341:Principal Component Analysis; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D014177:Translations; D055815:Young Adult
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