Validation of a food-frequency questionnaire assessment of carotenoid and vitamin E intake using weighed food records and plasma biomarkers: The method of triads model

McNaughton, S. A., Marks, G. C., Gaffney, P., Williams, G. and Green, A. (2005) Validation of a food-frequency questionnaire assessment of carotenoid and vitamin E intake using weighed food records and plasma biomarkers: The method of triads model. European Journal of Clinical Nutrition, 59 2: 211-218. doi:10.1038/sj.ejcn.1602060


Author McNaughton, S. A.
Marks, G. C.
Gaffney, P.
Williams, G.
Green, A.
Title Validation of a food-frequency questionnaire assessment of carotenoid and vitamin E intake using weighed food records and plasma biomarkers: The method of triads model
Journal name European Journal of Clinical Nutrition   Check publisher's open access policy
ISSN 0954-3007
Publication date 2005
Sub-type Article (original research)
DOI 10.1038/sj.ejcn.1602060
Volume 59
Issue 2
Start page 211
End page 218
Total pages 8
Editor J C Seidell
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2005
Language eng
Subject C1
321205 Nutrition and Dietetics
730215 Nutrition
1111 Nutrition and Dietetics
Abstract Background: Reliability or validity studies are important for the evaluation of measurement error in dietary assessment methods. An approach to validation known as the method of triads uses triangulation techniques to calculate the validity coefficient of a food-frequency questionnaire (FFQ). Objective: To assess the validity of an FFQ estimates of carotenoid and vitamin E intake against serum biomarker measurements and weighed food records (WFRs), by applying the method of triads. Design: The study population was a sub-sample of adult participants in a randomised controlled trial of beta-carotene and sunscreen in the prevention of skin cancer. Dietary intake was assessed by a self-administered FFQ and a WFR. Nonfasting blood samples were collected and plasma analysed for five carotenoids (alpha-carotene, beta-carotene, beta-cryptoxanthin, lutein, lycopene) and vitamin E. Correlation coefficients were calculated between each of the dietary methods and the validity coefficient was calculated using the method of triads. The 95% confidence intervals for the validity coefficients were estimated using bootstrap sampling. Results: The validity coefficients of the FFQ were highest for alpha-carotene (0.85) and lycopene (0.62), followed by beta- carotene (0.55) and total carotenoids (0.55), while the lowest validity coefficient was for lutein (0.19). The method of triads could not be used for b- cryptoxanthin and vitamin E, as one of the three underlying correlations was negative. Conclusions: Results were similar to other studies of validity using biomarkers and the method of triads. For many dietary factors, the upper limit of the validity coefficients was less than 0.5 and therefore only strong relationships between dietary exposure and disease will be detected.
Keyword Nutrition & Dietetics
Validity Coefficient
Dietary Assessment
Biomarkers
Food-frequency Questionnaire
Weighed Food Record
Method Of Triads
Carotenoids
Vitamin E
Beta-carotene
Dietary-intake
Additional Measurements
Biochemical Markers
Alpha-tocopherol
Bioavailability
Supplementation
Vegetables
Lycopene
Humans
Food-frequency
Questionnaire
Q-Index Code C1

 
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