title: Comparison of single- and double-stage designs in the prevalence estimation of eating disorders in community samples.
abstract: The aim of this research was to compare two different case-identification designs: (a) a one-stage anonymous design using the Eating Disorders Examination-Questionnaire (EDE-Q; Fairburn & Beglin, 1994) as diagnostic instrument and (b) a two-stage-non-anonymous design using the Eating Attitudes Test (EAT; Garner & Garfinkel, 1979) and the EDE-Q as screening instruments and the clinical interview Eating Disorders Examination (EDE; Fairbumrn & Cooper, 1993) as diagnostic instrument, in the estimation of eating disorders prevalence in community samples. Both epidemiological designs were compared in: eating disorders prevalence, population at risk, and weekly frequency of associated symptomatology (binge eating episodes, self-vomiting) within a sample of 559 scholars (14 to 18 year-old males and females) studying in the region of Madrid. Eating disorders prevalence estimation using single-stage design was 6.2%, and 3% using the two-stage design; however, these differences were not significant (p = .067). No significant differences between the two procedures were found either in population at risk or in weekly frequency of reported self-vomiting. Reported binge eating episodes were higher in the one-stage design. The use of a two-stage procedure with clinical interview (vs. questionnaire) leads to a better understanding of the items (specially the most ambiguous ones) and thus, to a more accurate prevalence estimation.
authors.affiliation: Department of Psychology, University of Toronto at Mississauga, Ontario, Canada. angeles.pelaez@utoronto.ca
authors.forename: María Angeles
authors.initials: MA
authors.lastname: Peláez-Fernández
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Labrador
authors.forename: Rosa María
authors.initials: RM
authors.lastname: Raich
mesh_terms: D000293:Adolescent; D000856:Anorexia Nervosa / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D052018:Bulimia Nervosa / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D003430:Cross-Sectional Studies; D001068:Feeding and Eating Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008403:Mass Screening; D011594:Psychometrics / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D013030:Spain; D011795:Surveys and Questionnaires