OBJECTIVES: to evaluate a Food Frequency Questionnaire (FFQ) previously designed by Sichieri and Everhart to provide information about food consumption among pregnant women attended by the Brazilian National Health Service. To compare the mean daily intakes of energy and nutrients as assessed using a FFQ and dietary recalls. METHODS: the study took place in two cities: Bento Gonçalves and Porto Alegre, State of Rio Grande do Sul, Brazil. During a first interview, the FFQ was administered to pregnant women, followed by two dietary recalls. In a second interview two further food recalls were obtained. The Bland-Altman analysis was used to assess the degree of agreement between the FFQ and dietary recalls. RESULTS: the FFQ produced higher energy and nutrient intakes. The correlation coefficient between nutrient intake measured using dietary recalls and using the questionnaire, after adjusting for energy intake, ranged from 0.1 (unsaturated fat) to 0.47 (calcium). The nutrients: fiber, Vitamin C, folate, calcium and potassium showed higher coefficients (above 0.4). Thirty percent of individuals were classified by the two dietary assessment methods into the same quartile. CONCLUSION: this FFQ is a useful tool for epidemiological studies among pregnant women; although efforts need to be made to improve its performance. More studies are necessary to identify sociocultural and behavioural factors that influence its validity.
Maternal nutrition; Food consumption; Pregnant women; Food frequency questionnaire
