Within-person variability of nutrient intake in a group of Hawaiian men of Japanese ancestry

D. McGee, G. Rhoads, J. Hankin, K. Yano, J. Tillotson

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

Within-person variability of nutrient intake is examined using data on 7 consecutive days for 329 men. The variability of nutrient intake within persons differs for the nutrients examined. Some nutrients, such as starch, have small within-person components of variance and are therefore highly reliable even using a single 24-h recall. Others, such as polyunsaturated fatty acids, have large within-person components of variance and are thus less reliable. Within-person variability affects the power of a study to detect differences in nutrient intake between groups and also affects the magnitude of calculated correlation coefficients. For the least reliable nutrient it is estimated that the correlation would be attenuated of two-thirds its true size. Eating patterns in the cohort appear to be nonrandom. Using the nonrandomness of nutrient intake it may be possible to reduce the within-person component of variance using less recalls than is suggested if random eating patterns are assumed.

Original languageEnglish (US)
Pages (from-to)657-663
Number of pages7
JournalAmerican Journal of Clinical Nutrition
Volume36
Issue number4
StatePublished - Dec 1 1982
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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