A meta-analysis of the reproducibility of food frequency questionnaires in nutritional epidemiological studies.
Qi CuiYang XiaQijun WuQing ChangKaijun NiuYu-Hong ZhaoPublished in: The international journal of behavioral nutrition and physical activity (2021)
In conclusion, FFQs with correlation coefficients greater than 0.5 for most nutrients may be considered a reliable tool to measure dietary intake. To develop FFQs with higher reproducibility, the number of food items and dietary recall interval should be taken into consideration.