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  1. Validation of dietary assessment methods in the UK arm of EPIC using weighed records, and 24-hour urinary nitrogen and potassium and serum vitamin C and carotenoids as biomarkers.

    Article - En anglais

    Background

    In the UK EPIC validation studies, the accuracy of several methods was assessed by comparison with 16-day weighed records and the biomarkers, 24-hour urine nitrogen (N) and potassium (K), plasma carotenoids and plasma vitamin C. Methods.

    Comparisons between methods were made on 156 women, studied over 1 year at 3-monthly intervals at home.

    On each of four occasions, volunteers completed 4 days of weighed records and provided two 24-hour urine collections and a fasting blood sample.

    Results

    In comparison with the 16 days of weighed records, a food frequency questionnaire (FFQ) yielded higher values mainly due to greater reported consumption of milk and of vegetables.

    A 24-hour recall was as good as the FFQ in placing individuals in the distribution of habitual diet from weighed records.

    Results obtained from a 7-day estimated record were closest to those obtained from the weighed record.

    Correlations between 24-hour urine excretion and dietary N intake from weighed records were high (0.78-0.87) as were those with estimated food diaries (0.60-0.70).

    Correlations between urine N and the FFQ and 24-hour recall were lower (0.10 to 0.27), but improved by energy adjustment using residuals for N and K which are correlated with total energy intake.

    Comparisons between dietary estimates and urinary K and serum carotenoids and vitamin C showed broadly similar results. (...)

    Mots-clés Pascal : Consommation alimentaire, Comportement alimentaire, Questionnaire, Méthodologie, Etude comparative, Epidémiologie, Validation test, Royaume Uni, Europe, Homme, Projet EPIC, Fréquence alimentaire, Agenda alimentaire, Rappel 24 heures

    Mots-clés Pascal anglais : Food intake, Feeding behavior, Questionnaire, Methodology, Comparative study, Epidemiology, Test validation, United Kingdom, Europe, Human, Diet diary, 24 hour recall

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 97-0263793

    Code Inist : 002B29A. Création : 11/06/1997.