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Sources of variation of energy and nutrient intake among adolescents in São Paulo, Brazil.

Authors
  • Verly Junior, Eliseu
  • Fisberg, Regina Mara
  • Cesar, Chester Luis Galvão
  • Marchioni, Dirce Maria Lobo
Type
Published Article
Journal
Cadernos de Saúde Pública
Publisher
SciELO
Publication Date
Nov 01, 2010
Volume
26
Issue
11
Pages
2129–2137
Identifiers
PMID: 21180986
Source
Medline
License
Unknown

Abstract

The aim of the current study was to describe the sources of variation of energy and nutrient intake and to calculate the number of repetitions of diet measurements to estimate usual intake in adolescents from São Paulo, Brazil. Data was collected using 24-hour dietary recalls (24hR) in 273 adolescents between 2007 and 2008. Individuals completed a repeat 24hR around two months later. The sources of variation were estimated using the random effect model. Variance ratios (within-person to between-person variance ratio) and the number of repetitions of 24hR to estimate usual intake were calculated. The principal source of variation was due to within-person variance. The contribution of day of week and month of year was less than 8%. Variations ranged from 1.15 for calcium to 7.31 for vitamin E. The number of 24hR repeats required to estimate usual intake varied according to nutrient and gender, numbering 15 for males and 8 for females.

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