Objective To evaluate the reproducibility and validity of a food frequency questionnaire (FFQ) among children and adolescents in Beijing. Methods A total of 130 school children and adolescents aged 10~17 years old were enrolled in Beijing,China.Two FFQ surveys and four 24-hour recalls were collected over a 6-month period.Reproducibility was evaluated by comparing two FFQ surveys; validity was evaluated by comparing the 24-hour recalls against FFQ data. Results Except for protein,phosphorus and zinc,intakes of the other nutrients were not significantly different between two FFQs (P>0.05).Nutrient intakes between two FFQs showed positive correlation (P<0.01).Pearson correlations ranged from 0.32 (for calcium) to 0.52 (for zinc);and better in girls than in boys (0.49 vs 0.32).Regarding the FFQ's validity,nutrient intakes from FFQs were greater than 24-hour recalls (P<0.01).After adjusted for total energy and intra-individual variation,all nutrient intakes showed positive correlation (P<0.05),and the correlations became stronger.The adjusted correlations ranged from 0.27 (for vitamin A) to 0.53 (for zinc),with a mean of 0.38.For quartiles of the intakes,rates of FFQs and 24-hour recalls agreement were between 66.2% (for vitamin E and calcium) and 79.2% (for iron),and misclassification to an extreme quartile was low (6.2%). Conclusions The reproducibility and validity of the FFQ are modest and acceptable.It is feasible to use FFQ to assess the target population's dietary intakes.
Key words
food frequency questionnaire /
24-hour diet recall /
reproducibility /
validation /
children /
adolescents
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