The Dutch EPIC food frequency questionnaire. II. Relative validity and reproducibility for nutrients.
A self-administered semi-quantitative food frequency questionnaire (FFQ) was developed for the Dutch cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC).
The reproducibility and relative validity of nutrient intake as assessed by this questionnaire were investigated in a population of 121 ten and women.
To assess the relative validity, 12 monthly 24-hour recalls served as reference method, together with four determinations of 24-hour urinary nitrogen excretion, predicted basal metabolic rate, and serum bêta-carotene and alpha-tocopherol levels.
Protein and, among women, energy intake were underestimated by the questionnaire compared to urinary nitrogen excretion and the basal metabolic rate, respectively.
The underestimation for protein decreased with increasing protein intake.
Pearson correlation coefficients between nutrient intakes assessed by repeated questionnaires ranged from 0.70 to 0.94 among ten and from 0.59 to 0.94 among women.
Correlation coefficients between nutrient intakes assessed by the questionnaire and 24-hour recalls ranged from 0.26 to 0.83 for ten and from 0.35 to 0.90 for women, with medians of 0.59 and 0.58, respectively.
Correlation coefficients between 0.2 and 0.5 were observed for bêta-carotene and vitamin C for ten and for bêta-carotene and vitamin E for women.
Associations with serum bêta-carotene (r=-0.16 for ten ; 0.13 for women) and alpha-tocopherol (0.23 and 0. (...)
Mots-clés Pascal : Epidémiologie, Méthodologie, Consommation alimentaire, Comportement alimentaire, Questionnaire, Nutriment, Validation test, Fidélité test, Pays Bas, Europe, Projet EPIC, Fréquence alimentaire
Mots-clés Pascal anglais : Epidemiology, Methodology, Food intake, Feeding behavior, Questionnaire, Nutrient, Test validation, Test reliability, Netherlands, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0262640
Code Inist : 002B29A. Création : 11/06/1997.