Validação relativa de Questionário de Freqüência Alimentar em gestantes usuárias de serviços do Sistema Único de Saúde em dois municípios no Rio Grande do Sul, Brasil

Abstract

Rev. Bras. Saúde Matern. Infant., Recife, 8 (4): 445-454, out. / dez., 2008 445 ARTIGOS ORIGINAIS / ORIGINAL ARTICLES Validação relativa de Questionário de Freqüência Alimentar em gestantes usuárias de serviços do Sistema Único de Saúde em dois municípios no Rio Grande do Sul, Brasil Validation of a Food Frequency Questionnaire conducted among pregnant women attended by the Brazilian National Health Service, in two municipalities of the State of Rio Grande do Sul, Brazil

Relative validation of a quantitative FFQ for use in Brazilian pregnant women

“…The quadratic weighted k value found in the present study was low, in line with findings of a previous FFQ validation study conducted in Brazil reporting k values ranging from 0?39 for vitamin C to 0?06 for Cu (14) .…”

“…For instance, in a study of eighty US pregnant women using three replicates of 24hR, Forsythe and Gage (10) found Pearson's correlation coefficients ranging from 0?42 for vitamin B 12 to 0?46 for Fe. In a study conducted among pregnant women in Brazil, Giacomello et al (14) identified Pearson's correlation coefficients of between 0?01 for saturated fats and 0?47 for Ca, taking two 48hR as the reference method. The low correlation coefficients seen in validation studies of FFQ for pregnant women can be partially explained by the high within-person variability in estimated energy and nutrient intakes during this phase of life, especially when few replications of 24hR or records are taken as the reference method (12) .…”

“…Validation studies of FFQ for use in pregnant women have shown that nutrient estimates using this method exhibit high levels of agreement with intake estimates using the 24 h dietary recall (24hR) (12)(13)(14) or daily records (DR) (15,16) , suggesting a good accuracy of the FFQ for assessing dietary intake in this population group. Since 24hR and FFQ might have correlated errors, related to memory and estimation of portion size, the use of multiple DR or weighed records as the reference method is recommended.…”

Dietary patterns during pregnancy and the association with sociodemographic characteristics among women attending general practices in southern Brazil: the ECCAGe Study

“…A relative validation of the 24-hour dietary recall and the FFQ resulted in a Pearson correlation coefficient of 0.17 for energy intake (p < 0,05). The correlation coefficient ranged between 0.01 (vitamin E, p > 0,05) and 0.43 (vitamin C, p < 0,01) 35 .…”

Reprodutibilidade, validade relativa e calibração de um questionário de frequência alimentar para adultos da Região Metropolitana de Porto Alegre, Rio Grande do Sul, Brasil

“…Quando são considerados os LDC para as comparações entre o QFA e o método de referência, observa-se que estes são amplos para a maioria dos nutrientes, indicando discordância entre os métodos por esta abordagem. Achados semelhantes foram vistos em outros estudos de validação de QFA 6,30 .…”