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Factors associated with the calibration of a food frequency questionnaire for the Bambuí Project, Brazil
A C S Lopes1, W T Caiaffa, R Sichieri
1Departamento de Enfermagem Materno-Infantil e Saúde Pública-Escola de Enfermagem, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Background:
The present study aimed to calibrate a food frequency questionnaire (FFQ) using one 24-h recall (R24) associated with foodstuff replicas.
Methods:
Calibration was performed by linear regression. Of a probability sample of 150 individuals (>18 years) of the town of Bambui, 98 completed the study.
Results:
The mean age of the participants was 43.8 years and 63.3% were women. The calibration of the FFQ included sex for the estimation of iron, protein and zinc; and an interaction between sex and R24 was significant for vitamin A and cholesterol models. Age contributed to the vitamin C, polyunsaturated fatty acids, proteins and zinc models, and an interaction between age and R24 was significant for protein and zinc.
Conclusions:
Calibration coefficients and many interactions in linear regression models revealed important differences between dietary methods, indicating the complexity encountered when combining two methodologies for estimating food intake.
