BACKGROUND: Measurable data on plastic surgery outcomes are scarce. In recent years, questionnaires to measure quality of life have been used globally. In Brazil, there are no questionnaires validated and adapted in the Brazilian population that specifically assess quality of life after breast surgery. The aim of this study was to translate the Breast Evaluation Questionnaire (BEQ 55) into Portuguese, and culturally adapt and validate the translation for use in Brazil.
METHODS: Two translations, two revisions by a multidisciplinary group, and two back translations of the questionnaire were performed. Cultural adaptation was performed by applying the questionnaire to groups of 20 patients from the plastic surgery outpatient clinic. The questionnaire included relevant modifications for better understanding of the questions. To test the questionnaire's reproducibility and validity, 20 patients were interviewed on two separate occasions. On the first occasion, they were interviewed by different interviewers, and on the second occasion (after 7 days and after 14 days), by only one. In addition, the Short-Form 36 was applied during the first interview.
RESULTS: During cultural adaptation, questions were modified to facilitate the patients' understanding. A new group was tested to confirm that items were understood. Internal consistency of the questionnaire ranged between 0.931 and 0.936. The interobserver reproducibility coefficient was 0.962, and the intraobserver reproducibility coefficient was 0.919. Only the domains of the SF-36 regarding functional capacity, general health status, and emotional aspects correlated with the total score of the BEQ 55.
CONCLUSIONS: The BEQ 55 questionnaire was successfully translated and adapted. The Brazilian version was called "Questionário de Avaliação das Mamas (BEQ-Brasil)" and was demonstrated to be valid and reproducible.
Keywords: Breast/surgery. Quality of life. Plastic surgery. Questionnaires.