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.
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.
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
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0263793
Code Inist : 002B29A. Création : 11/06/1997.