title: Dietary assessment in the 1993 Pelotas (Brazil) birth cohort study: comparing energy intake with energy expenditure.
abstract: The study aims to describe and compare two methods of energy intake assessment and one measure of energy expenditure applied in adolescents from a birth cohort. In a sub-sample of the 1993 Pelotas (Brazil) birth cohort, followed up in 2006-7, information on intake was obtained through a food-frequency questionnaire (FFQ) and three 24-hour-recalls (24hR), while energy expenditure was assessed using an accelerometer. Bland & Altman plots were used in the analyses in order to compare the methods. The mean difference between FFQ and 24hR was 592 ± 929cal/day. Compared to energy expenditure, intake was overestimated when measured by FFQ (357 ± 968cal/day) and underestimated by 24hR (-278 ± 714cal/day). In spite of the great differences between energy intake obtained using the two methods, lower differences were observed when these methods were compared to expenditure.
authors.affiliation: Universidade Federal de Pelotas, Brasil. denise.gigante@terra.com.br
authors.forename: Denise P
authors.initials: DP
authors.lastname: Gigante
authors.forename: Felipe Fossati
authors.initials: FF
authors.lastname: Reichert
authors.forename: Pedro C
authors.initials: PC
authors.lastname: Hallal
authors.forename: Rosângela Velleda de
authors.initials: RV
authors.lastname: Souza
authors.forename: Marilda Borges
authors.initials: MB
authors.lastname: Neutzling
authors.forename: Maria de Fátima Alves
authors.initials: Mde F
authors.lastname: Vieira
authors.forename: Maria Cecilia Formoso
authors.initials: MC
authors.lastname: Assunção
authors.forename: Cora Luiza
authors.initials: CL
authors.lastname: Araújo
authors.forename: Ana M B
authors.initials: AM
authors.lastname: Menezes
mesh_terms: D056044:Actigraphy / Q000295:instrumentation; D000293:Adolescent; D001938:Brazil; D015331:Cohort Studies; D004034:Diet Surveys / Q000379:methods*; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall; D015233:Models, Statistical