Validation and calibration of a semiquantitative food frequency questionnaire designed for adolescents

Journal of the American Dietetic Association
Marina Campos AraujoRosangela Alves Pereira

Abstract

Epidemiologic studies must have a reliable method for evaluating food intake; therefore, valid, precise, and practical instruments are essential. To assess the relative validity and estimate the calibration factors of a semiquantitative food frequency questionnaire (FFQ) for adolescents. Validation and calibration study. This study enrolled 169 adolescents from Rio de Janeiro, Brazil. A set of three food records was used as the reference method. The relative validity was analyzed according to weighted kappa values for the quartile categorization of energy and nutrient intakes, Pearson correlation coefficients, and the Bland-Altman method. To estimate the calibration factors for the FFQ, linear regression models, including the food record means as dependent variables and the FFQ estimations as independent variables were developed for boys and girls. The weighted kappa values ranged from 0.28 to 0.44 for the raw data and from 0.16 to 0.39 for the deattenuated and energy-adjusted data. The Pearson correlation coefficients ranged from 0.33 to 0.46, and the mean agreement varied from 62% to 143%. The calibration factors estimated for boys ranged from 0.15 to 0.48, and the factors estimated for girls ranged from 0.14 to 0.47. The mea...Continue Reading

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Jul 15, 2011·Public Health Nutrition·Letícia Ferreira TavaresEdna Massae Yokoo
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