Food Frequency Questionnaire
When the pregnant participants in the DNBC were in gestational week 25 they received a paper Food Frequency Questionnaire by ordinary mail.
Food Frequency in pregnancy
Most questions focused on the dietary habits during the 4 weeks prior to completion of the questionnaire, but a number of questions addressed changes in dietary habits during pregnancy. Most questions are food frequency questions. The frequency method has proven efficient when food patterns are to be established in a large group of people.