• Camila H Scarpatto, Laura L G Ley, Camila O Ayala, Cátia Regina Machado, Alexandre Vontobel Padoin, de Jezus CastroStela MarisSMDepartment of Statistics, Universidade Federal de Rio Grande do Sul (UFRGS), Porto Alegre, Brazil., Wilson Cañon-Montañez, and Rita Mattiello.
• School of Medicine, Postgraduate Program in Pediatrics and Child Health and Postgraduate Program in Medicine and Health Sciences, Pontifícia Universidade Católica de Rio Grande do Sul (PUCRS), Porto Alegre, Brazil.
• Aten Primaria. 2023 Apr 1; 55 (4): 102599102599.

ObjectiveThis study aimed to develop the Brazilian instrument for assessing eating disorders in children and adolescents and test its psychometric quality using item response theory (IRT).DesignCross-sectional study.ParticipantsParticipants aged between five and twelve years old of both sexes.Main MeasuresIRT logistic model of two parameters was used to evaluate the item's severity and discrimination and test information curve of symptoms of eating disorders' latent trait symptoms. Content validity and reliability were also assessed. The IRT evaluation suggested that the instrument contained items that performed differently concerning severity, discrimination, and test information curve presented good accuracy.ResultsThere was agreement on the clarity of language (83.3%) and theoretical relevance (91.7%), indicating good content validity. The value of the Cronbach's Alpha was 0.63 (95% confidence interval), and the result of the Spearman-Brown test was 0.65.ConclusionThese results indicate good performance of the screening tool in assessing the level of eating disorders in children and adolescents.Copyright © 2023 The Authors. Publicado por Elsevier España, S.L.U. All rights reserved.

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