486 biomed environ sci 2019 32 7 486 495 original article food frequency questionnaire for chinese children aged 12 17 years validity and reliability 1 1 1 1 2 liu ...
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...Biomed environ sci original article food frequency questionnaire for chinese children aged years validity and reliability liu dan ju la hong yang zhen yu zhang qian gao jian fen gong di ping guo luo shu quan zhao wen hua national institute nutrition health center disease control prevention beijing china yanqing wanzhou chongqing abstract objective the primary of this study was to examine a semi quantitative ffq among methods item developed were evaluated against h dietary recalls drs measure consumption foods nutrients we administered two ffqs three n over period month evaluate examined by quartile agreement intraclass correlation coefficients iccs bland altman plots with results between ranged from in same or adjacent quartiles spearman s second demonstrated good across range intakes infrequent misclassification conclusion assessment acceptable relative high reproducibility key words doi bes issn www besjournal com full text cn q copyright cdc introduction weighed records narrative di...