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Variance sources and ratios to estimate energy and nutrient intakes in a sample of adolescents from public schools, Natal, Brazil Fontes e razões de variância para estimar a ingestão de energia e nutrientes de uma amostra de adolescentes de escolas públicas

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Author(s): Severina Carla Vieira Cunha Lima | Clélia Oliveira Lyra | Karine Cavalcanti Maurício Sena-Evangelista | Liana Galvão Bacurau Pinheiro | Célia Márcia Medeiros Morais | Betzabeth Slater | Lucia Fatima Campos Pedrosa

Journal: Revista de Nutrição
ISSN 1415-5273

Volume: 26;
Issue: 2;
Start page: 159;
Date: 2013;
Original page

Keywords: Adolescente | Ingestão de energia | Consumo de alimentos | Nutrientes | Adolescent | Energy intake | Food consumption | Nutrients

ABSTRACT
OBJECTIVE: The aim of this study was to describe the sources of dietary variance, and determine the variance ratios and the number of days needed for estimating the habitual diet of adolescents. METHODS: Two 24 hour food recalls were used for estimating the energy, macronutrient, fatty acid, fiber and cholesterol intakes of 366 adolescents attending Public Schools in Natal, Rio Grande do Norte, Brazil. The variance ratio between the intrapersonal and interpersonal variances, determined by Analysis of Variance, was calculated. The number of days needed for estimating the habitual intake of each nutrient was given by the hypothetical correlation (r)>0.9 between the actual and observed nutrient intakes. RESULTS: Sources of interpersonal variation were higher for all nutrients and in both genders. Variance ratios were 0,9, entre a verdadeira ingestão de nutrientes e a observada. RESULTADOS: As fontes de variância interpessoal foram maiores para todos os nutrientes e em ambos os sexos. As razões de variâncias foram

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