SciELO - Scientific Electronic Library Online

vol.23 issue9Chronic illness from the perspective of patients and health professionals: a qualitative study in MexicoHIV prevalence and risk factors in a Brazilian penitentiary author indexsubject indexarticles search
Home Page  

Services on Demand




Related links


Cadernos de Saúde Pública

On-line version ISSN 1678-4464Print version ISSN 0102-311X


MARCHIONI, Dirce Maria Lobo et al. Reproducibility of a food frequency questionnaire for adolescents. Cad. Saúde Pública [online]. 2007, vol.23, n.9, pp.2187-2196. ISSN 1678-4464.

To assess the reproducibility of a validated 76-item food frequency questionnaire designed to estimate diet in adolescents (Adolescent Food Frequency Questionnaire - AFFQ) in the city of Sao Paulo, Brazil, a test-retest study was conducted (n = 49). Intraclass correlation coefficient (ICC), weighted kappa, and percentage of agreement were used in both crude and energy-adjusted nutrient intakes. Bland Altman plots were used to examine the limits of agreement for energy and macronutrients. The ICC ranged from 0.48 (carbohydrates) to 0.65 (vitamin C) in crude values and from 0.25 (total fat) to 0.58 (vitamin C) in adjusted values. Kappa values ranged from 0.28 (protein and fiber) to 0.56 (unsaturated fat). Bland Altman showed a trend towards larger difference in energy according to increased intake values and a bias towards extreme values for fat intake. The percent of individuals classified in the same category on the two occasions was on average 54.2%. By conclusion, the Adolescent Food Frequency Questionnaire showed reasonable reproducibility and can be used in studies that aim to classify groups into intake categories.

Keywords : Adolescent; Food Habits; Questionnaires; Reproducibility of Results.

        · abstract in Portuguese     · text in English     · English ( pdf )