Measurement of fruit and vegetable consumption with diet questionnaires and implications for analyses and interpretation

Michels, Karin B., Welch, Ailsa A., Luben, Robert, Bingham, Sheila A. and Day, Nicholas E. (2005) Measurement of fruit and vegetable consumption with diet questionnaires and implications for analyses and interpretation. American Journal of Epidemiology, 161 (10). pp. 987-994. ISSN 1476-6256

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Abstract

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.

Item Type: Article
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Science > Research Groups > Norwich Epidemiology Centre
Faculty of Medicine and Health Sciences > Research Groups > Norwich Epidemiology Centre
Faculty of Medicine and Health Sciences > Research Groups > Public Health and Health Services Research
Faculty of Medicine and Health Sciences > Research Groups > Epidemiology and Public Health
Depositing User: EPrints Services
Date Deposited: 25 Nov 2010 11:10
Last Modified: 17 Apr 2023 23:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/13260
DOI: 10.1093/aje/kwi115

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