Validação de um questionário quantitativo de frequência alimentar desenvolvido para universitários

Validou-se um Questionário Quantitativo de Frequência Alimentar em 50 graduandos em Saúde de São Paulo, Brasil. Considerou-se o registro alimentar de 3 dias como referência e variáveis energia, macronutrientes e fibras alimentares. A concordância entre o Questionário Quantitativo de Frequência Alimentar e a média dos registros alimentares de 3 dias foi avaliada pela estatística kappa, pelo coeficiente de correlação intraclasse (ICC) e percentual de concordância. Os limites de concordância foram examinados pelos gráficos de Bland-Altman. Melhores valores de coeficiente de correlação intraclasse foram encontrados para calorias (ICC 0,43; IC95% 0,17 – 0,63) e para nutrientes não ajustados por calorias, com exceção das fibras (ICC 0,34; IC95% 0,07 – 0,56). O percentual de concordância mostrou uma minoria classificada em terços opostos (16%) e aproximadamente metade classificada no mesmo terço (49.8%). Houve tendência à superestimação nos dados do Questionário Quantitativo de Frequência Alimentar para calorias e nutrientes, exceto gorduras. Recomenda-se a utilização deste instrumento em população universitária em estudos que visem à estimativa de calorias, bem como à classificação dos indivíduos em categorias de consumo.A validity test of a Food Frequency Questionnaire was carried out using 50 students of health occupation in São Paulo, Brazil. Therefore, a three day dietary record was used as reference method and variables such as energy, macronutrients and dietary fiber were analyzed. The accordance between the Food Frequency Questionnaire and average data from dietary record was tested with kappa statistics and intra-class correlation coefficients (ICC). Limits of agreement were estimated by the Bland-Altman's method. Better results were found for calories (ICC 0.43; 95%CI 0.17 - 0.63) and non-energy-adjusted nutrients, except dietary fiber (ICC 0.34; 95%CI 0.07 - 0.56). The percentage of individuals classified in the same category of consumption was nearly half (49.8%), while only 16% of them were classified in opposite categories. With the exception of lipids, other analyzed variables tended to be overestimated by the Food Frequency Questionnaire. The Food Frequency Questionnaire is recommended as a method of assessing food intake of university students in studies which focuson calorie estimates and also intend to classify groups into intake categories

Validation of a quantitative food frequency questionnaire developed to under graduate students

A validity test of a Food Frequency Questionnaire was carried out using 50 students of health occupation in São Paulo, Brazil. Therefore, a three day dietary record was used as reference method and variables such as energy, macronutrients and dietary fiber were analyzed. The accordance between the Food Frequency Questionnaire and average data from dietary record was tested with kappa statistics and intra-class correlation coefficients (ICC). Limits of agreement were estimated by the Bland-Altman's method. Better results were found for calories (ICC 0.43; 95%CI 0.17 - 0.63) and non-energy-adjusted nutrients, except dietary fiber (ICC 0.34; 95%CI 0.07 - 0.56). The percentage of individuals classified in the same category of consumption was nearly half (49.8%), while only 16% of them were classified in opposite categories. With the exception of lipids, other analyzed variables tended to be overestimated by the Food Frequency Questionnaire. The Food Frequency Questionnaire is recommended as a method of assessing food intake of university students in studies which focuson calorie estimates and also intend to classify groups into intake categories