title: Test-retest reliability and discriminant validity of the Restraint Scale translated into Portuguese.
abstract: The aim of this study was to evaluate reliability and discriminant validity of the Restraint Scale (RS) translated into Portuguese. The version was obtained through a process of translation and back translation. Women with eating disorders (n = 39: 24 bulimics and 15 anorexics) and students without eating disorders (n = 57) filled the scale. It was hypothesized that if the scale has any discriminant validity, the bulimic scores should differ from those of the students and the anorexics. The questionnaire was applied twice to the controls with 1-month interval to evaluate test-retest stability. Bulimics obtained a score of 28.1 +/- 13 (significantly different from students and anorexics), anorexics obtained 17.3 +/- 9 (significantly different from students), and students 11.3 +/- 5. Body mass index (BMI) was significantly correlated to dietary restraint, especially among controls. Test-retest correlation coefficient was .64 (P = .000001). The RS translated into Portuguese seems to be a valid and reliable instrument, which can be used in many studies of eating behaviors.
authors.affiliation: Eating Disorder Program, Institute and Department of Psychiatry, University of São Paulo, São Paulo, Brazil. fesc@usp.br
authors.forename: Fernanda Baeza
authors.initials: FB
authors.lastname: Scagliusi
authors.forename: Viviane Ozores
authors.initials: VO
authors.lastname: Polacow
authors.forename: Táki Athanássios
authors.initials: TA
authors.lastname: Cordás
authors.forename: Desire
authors.initials: D
authors.lastname: Coelho
authors.forename: Marle
authors.initials: M
authors.lastname: Alvarenga
authors.forename: Sonia Tucunduva
authors.initials: ST
authors.lastname: Philippi
authors.forename: Antonio Herbert
authors.initials: AH
authors.lastname: Lancha
mesh_terms: D000328:Adult; D015992:Body Mass Index; D016002:Discriminant Analysis; D001068:Feeding and Eating Disorders / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007802:Language; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014177:Translations