The Dutch EPIC food frequency questionnaire. II. Relative validity and reproducibility for nutrients
| Autor: | Margreet A. Pols, Marga C. Ocké, Henriette A. Smit, W.A. van Staveren, Daan Kromhout, H. B. Bueno-De-Mesquita |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Adult
Male medicine.medical_specialty Nitrogen Epidemiology medicine.medical_treatment Population Nutritional Status Diet Surveys chemistry.chemical_compound Animal science Reference Values Surveys and Questionnaires Internal medicine medicine Humans Vitamin E education Aged Netherlands education.field_of_study business.industry Retinol Reproducibility of Results General Medicine Middle Aged beta Carotene Ascorbic acid Diet European Prospective Investigation into Cancer and Nutrition Endocrinology chemistry Mental Recall Cohort Basal metabolic rate Female Basal Metabolism Energy Intake business Relative validity |
| Zdroj: | International Journal of Epidemiology. 26:49S-58 |
| ISSN: | 1464-3685 |
| DOI: | 10.1093/ije/26.suppl_1.s49 |
| Popis: | Background 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). Methods The reproducibility and relative validity of nutrient intake as assessed by this questionnaire were investigated in a population of 121 men 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 beta-carotene and alpha-tocopherol levels. Results 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 men 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 men 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 beta-carotene and vitamin C for men and for beta-carotene and vitamin E for women. Associations with serum beta-carotene (r = -0.16 for men; 0.13 for women) and alpha-tocopherol (0.23 and 0.15, respectively) were much poorer than those obtained with 24-hour recalls. Correlations between protein intake and 24-hour urinary nitrogen excretion were 0.47 and 0.53, respectively. Conclusions The FFQ seems adequate for ranking subjects according to intake of energy, macronutrients, dietary fibre and retinol, but it does not yield such good results for beta-carotene, vitamin C for men, vitamin E for women. |
| Databáze: | OpenAIRE |
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