A longitudinal study was conducted to validate a 68-item semi-quantitative food-frequency
questionnaire (FFQ) for assessing nutrient intake among pregnant women in rural China.
The interview administrated FFQs were conducted at the start of the third trimester (FFQ1)
and repeated three months later prior to delivery (FFQ2), and compared with six repeated 24-
hour recalls collected between the FFQs. From June to September 2004, 125 women at 23
to 26 weeks of gestation were recruited into the study in two rural counties in Shaanxi …

This study aimed to evaluate the validity and reproducibility of a semi‐quantitative food
frequency questionnaire (FFQ) to estimate nutrient intake among Portuguese pregnant
women. A sample of 101 pregnant women completed a 3‐day food diary (FD) in each
pregnancy trimester (reference method) and an interviewer‐administered FFQ in the
immediate post‐partum period. Ranking women according to their usual intake showed that,
on average, 65% were classified into the same±1 quintile and 2.4% into opposite quintiles …