Validating an FFQ for intake of episodically consumed foods: application to the National Institutes of Health–AARP Diet and Health Study

Public Health Nutrition

Raymond J Carroll¹  Douglas Midthune¹  Laurence S Freedman¹  Marina A Shumakovich¹  Frances E Thompson¹  Victor Kipnis¹  Amy F Subar¹  Arthur Schatzkin¹ 

关键词: Diet;    Food;    Epidemiological methods;    Questionnaires;    Validation studies;   

DOI  :  10.1017/S1368980011000632

学科分类：卫生学

来源: Cambridge University Press

【 摘 要 】

ObjectiveTo develop a method to validate an FFQ for reported intake of episodically consumed foods when the reference instrument measures short-term intake, and to apply the method in a large prospective cohort.DesignThe FFQ was evaluated in a sub-study of cohort participants who, in addition to the questionnaire, were asked to complete two non-consecutive 24 h dietary recalls (24HR). FFQ-reported intakes of twenty-nine food groups were analysed using a two-part measurement error model that allows for non-consumption on a given day, using 24HR as a reference instrument under the assumption that 24HR is unbiased for true intake at the individual level.SettingThe National Institutes of Health–AARP Diet and Health Study, a cohort of 567 169 participants living in the USA and aged 50–71 years at baseline in 1995.SubjectsA sub-study of the cohort consisting of 2055 participants.ResultsEstimated correlations of true and FFQ-reported energy-adjusted intakes were 0·5 or greater for most of the twenty-nine food groups evaluated, and estimated attenuation factors (a measure of bias in estimated diet–disease associations) were 0·4 or greater for most food groups.ConclusionsThe proposed methodology extends the class of foods and nutrients for which an FFQ can be evaluated in studies with short-term reference instruments. Although violations of the assumption that the 24HR is unbiased could be inflating some of the observed correlations and attenuation factors, results suggest that the FFQ is suitable for testing many, but not all, diet–disease hypotheses in a cohort of this size.

【 授权许可】

Unknown