Journal
BRITISH JOURNAL OF NUTRITION
Volume 105, Issue 10, Pages 1530-1538Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007114510005246
Keywords
FFQ; Plasma biomarkers; Urinary biomarkers; Method of triads; Fruit and vegetable intake
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Funding
- Aktieselskabet Freia Chocolate Fabrik's Medical Foundation
- Throne-Holst Foundation for Nutrition Research
- Research Council of Norway
- Norwegian Cancer Society
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The aim of the present study was to validate the intakes of fruit, juice and vegetables from an FFQ. In sub-study I (n 147), intakes from the FFQ were evaluated against 7 d weighed food records (WR) and plasma carotenoid concentrations, whereas in sub-study II (n 85), the intakes were evaluated against plasma carotenoid concentrations and amounts of flavonoids in 24 h urine samples. Relative validity was evaluated by comparing median intakes, estimating correlation coefficients and validity coefficients using the method of triads. In sub-study I, we observed no significant difference in daily median fruit intake between the FFQ and the WR, whereas the intake of vegetables was higher from the FFQ than from the WR. The correlations between intakes from the FFQ and the WR ranged from 0.31 to 0.58. In sub-study II, the intakes of fruit and vegetables correlated significantly with plasma carotenoid concentrations and urinary flavonoids. The validity coefficients for the intakes of fruit and vegetables from the FFQ ranged from 0.61 to 0.88 in sub-study I and from 0.60 to 0.94 in sub-study II. In summary, based on the associations observed between intakes from the FFQ and the biomarkers and the FFQ validity coefficients, the FFQ was found valid and suitable for ranking individuals according to their usual intake of fruit, juice and vegetables.
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