QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Jahns, L. Articles by Popkin, B. M. Search for Related Content PubMed PubMed Citation Articles by Jahns, L. Articles by Popkin, B. M.

---

Nutritional Epidemiology

Within- and Between-Person Variation in Nutrient Intakes of Russian and U.S. Children Differs by Sex and Age^1,2

Lisa Jahns³, Alicia Carriquiry^*, Lenore Arab, Thomas A. Mroz^** and Barry M. Popkin⁴

Department of Nutrition and Carolina Population Center, University of North Carolina, Chapel Hill, NC 27516; ^* Department of Statistics, Iowa State University, Ames, IA 50011; Department of Epidemiology, University of North Carolina, Chapel Hill, NC 27516; and ^** Department of Economics and Carolina Population Center, University of North Carolina, Chapel Hill, NC 27516

⁴To whom correspondence should be addressed. E-mail: popkin{at}unc.edu.

Within- and between-person variation in nutrient intake has been characterized in different adult populations, but little is known of country, age, or sex differences among children. The objectives of this study were as follows: 1) to describe the mean intake, within- and between-individual CV and variance ratios of nutrient intake among children ages 9–18 y old in Russia and the United States in 1996; 2) to compare the age and sex-related differences in nutrient intake variance within and between countries; and 3) to hypothesize about the feasibility of using within-individual variance estimates from one nationally representative sample to adjust the usual intake distributions in another nationally representative sample. Mean intakes of all nutrients except magnesium were significantly higher among U.S. children (P < 0.001); within-person variation was higher among the U.S. children, possibly indicating greater access to a wide array of foods. Strong differentials existed in variance components by sex in both countries, although not in the same direction, and differed by age in U.S. girls. Ratios of within- to between-person variance in 8 of 11 nutrients were lower among Russian (range: 0.9–1.6) than U.S. children (range: 1.4–1.7), suggesting that day-to-day bias may not affect Russian dietary recalls as strongly as in the United States. Researchers are encouraged to use these estimates to conduct sensitivity analyses of usual intake distributions in their own data when multiple days of data collection are not feasible.

KEY WORDS: • diet recall • within-individual variation • between-individual variation • children • Russia

This article has been cited by other articles:

				I. Huybrechts, D. De Bacquer, B. Cox, E. H. Temme, H. Van Oyen, G. De Backer, and S. De Henauw Variation in energy and nutrient intakes among pre-school children: implications for study design Eur J Public Health, October 1, 2008; 18(5): 509 - 516. [Abstract] [Full Text] [PDF]