International Journal of Epidemiology, Vol 26, S100-S109, Copyright © 1997 by International Epidemiological Association
BACKGROUND: A pilot study was carried out to evaluate the relative validity
and reproducibility of a dietary history questionnaire (DH) administered by
interview and designed to be used in a prospective study on diet and
cancer. METHODS: The DH was administered twice, with a year's interval, to
91 volunteers of various occupational categories, aged 35-60 years, of both
sexes. Twelve 24-hour recalls applied monthly during the year between the
two administrations of the DH were used as a reference method. RESULTS:
Mean values of daily intake between the two methods were very similar for
most nutrients. The DH tended to underestimate intake, compared to the
24-hour recall, for some nutrients like saturated fat and dietary fibre in
males and saturated and polyunsaturated fat, cholesterol and retinol in
females. It tended to overestimate intake of vitamin C, retinol and
beta-carotene in males and dietary fibre, vitamin C and beta-carotene in
females. Pearson correlation coefficients between the daily intake of
nutrients based on the mean of the 12 24-hour recalls and the second use of
the DH showed most values to be > 0.80 in males (ranging from 0.28 for
retinol to 0.89 for energy, lipids, mono and polyunsaturated fat) and 0.60
in females (ranging from 0.33 for cholesterol to 0.83 for alcohol). For the
great majority of nutrients studied, more than 80% of the subjects
classified in the two highest quintiles and in the two lowest quintiles
according to the DH2 which coincided with the highest and lowest quintiles
of the classification according to the average of 24-hour recalls.
CONCLUSIONS: The DH method provides quite good information on the habitual
nutrient intake of the individual in a recent 1-year reference period.
ARTICLES
Relative validity and reproducibility of a diet history questionnaire in Spain. II. Nutrients. EPIC Group of Spain. European Prospective Investigation into Cancer and Nutrition
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