International Journal of Epidemiology, Vol 26, S110-S117, Copyright © 1997 by International Epidemiological Association
BACKGROUND: A dietary history questionnaire (DH) administered by interview
was validated against 12 24-hour recalls. Relative validity of the DH and
the 24-hour diet recalls was assessed by comparing nutrient intake derived
from both methods with the urinary excretion of nitrogen (N) and plasma
levels of carotenes, vitamin E and vitamin C. METHODS: The urinary
excretion of N was estimated from four 24-hour urine collections of 64
subjects (30 males and 34 females), and plasma levels of carotenes and
vitamins C and E from one fasting blood collection in 72 subjects (32 men
and 40 women). RESULTS: The mean difference (g/day) between N excretion and
N intake was -0.73 (-3.1%) for the DH and -1.4 (-8.2%) for the 24-hour diet
recalls. The Pearson correlation coefficients were 0.58 and 0.52
respectively. The crude Pearson correlation coefficient between plasma
level of vitamin C and dietary intake according to the DH was 0.46 and
according to the 24- hour diet recall was 0.49. For beta-carotene it was
0.33 and 0.42 and for total carotenoids it was 0.27 and 0.28. For vitamin
E, after adjusting for cholesterol levels and energy intake, it was 0.33
and 0.36. Some differences were found by gender and smoking habit.
CONCLUSIONS: The DH method gives similar results to those from the 24- hour
diet recall that was used as the dietary reference method which
demonstrated that DH can provide a relatively valid measurement of habitual
intake for the studied nutrients.
ARTICLES
Relative validity and reproducibility of a diet history questionnaire in Spain. III. Biochemical markers. EPIC Group of Spain. European Prospective Investigation into Cancer and Nutrition
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