Calibration of a semi-quantitative food frequency questionnaire in early pregnancy

@article{Fawzi2004CalibrationOA,
  title={Calibration of a semi-quantitative food frequency questionnaire in early pregnancy},
  author={Wafaie Wahib Fawzi and Sheryl L. Rifas-Shiman and Janet W Rich-Edwards and Walter C Willett and Matthew W Gillman},
  journal={Annals of epidemiology},
  year={2004},
  volume={14 10},
  pages={
          754-62
        }
}
PURPOSE We assessed the validity of a semi-quantitative food frequency questionnaire (FFQ) among pregnant women. METHODS We enrolled 72 African American and 132 Caucasian pregnant women in a calibration study of an existing FFQ. For eight categories of intake of fatty acids, carotenoids, and gamma- tocopherol estimated by the FFQ (energy-adjusted deciles 1, 2, 3, 4+5, 6+7, 8, 9, 10) we compared measurements of the corresponding nutrient level measured in pooled blood specimens from all… CONTINUE READING
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