期刊
AMERICAN JOURNAL OF EPIDEMIOLOGY
卷 161, 期 10, 页码 987-994出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/aje/kwi115
关键词
bias (epidemiology); data collection; diet; food; nutrition assessment; questionnaires; regression analysis
资金
- FIC NIH HHS [F06 TW05568, F06 TW005568, F06 TW005568-01] Funding Source: Medline
- NIDDK NIH HHS [R01 DK054900, R01 DK054900-02, R01 DK 54900] Funding Source: Medline
- Wellcome Trust Funding Source: Medline
Measurement error can have an important impact on the estimation of the true relation between diet and disease. The authors examined the performance of models regressing plasma vitamin C level on fruit and vegetable consumption and the effect of categorization of fruit and vegetable consumption on the association with plasma vitamin C. They used diet information reported by 4,487 participants in the Norfolk, United Kingdom, portion of the European Prospective Investigation into Cancer and Nutrition by means of a 7-day diet diary and a food frequency questionnaire (FFQ) (1993-1998). The authors found substantial differences in mean fruit and vegetable consumption assessed by the two diet instruments. Consumption estimated with the FFQ was about twice as high as that obtained with the 7-day diary, and the ranking of individuals according to estimates of fruit and vegetable consumption from the 7-day diary and the FFQ differed substantially. When fruit and vegetable consumption were categorized into quintiles, the two questionnaires produced similar associations of relative intake with plasma vitamin C, but estimation of the association of absolute intake with plasma vitamin C differed.
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