Document Detail

Implications of day-to-day variability on measurements of usual food and nutrient intakes.
MedLine Citation:
PMID:  12514296     Owner:  NLM     Status:  MEDLINE    
Day-to-day variability in dietary intake makes it difficult to measure accurately the "usual" intake of foods and nutrients. The objectives of the present study were to estimate within- and between-subject variability for foods and nutrients by adjusted and unadjusted models and to assess the number of days required to assess nutrient and food group intakes accurately by two different methods. Adult men and women aged 18-65 y (n = 1543) in the Food Habits of Canadians Study provided a 24-h recall. A repeat interview was conducted in a subsample to estimate components of variability. Within- and between-subject variability were determined by mixed model procedure (crude and adjusted for age, gender, education, smoking, family size and season). The number of days required to obtain various degrees of accuracy was ascertained by two methods, one that uses the variance ratio for groups and one that considers within-subject variability alone for individuals. Variance ratios were higher using the adjusted compared with the unadjusted method (e.g., for men, energy 1.07 vs. 0.49). More days were required to reflect usual intake with accuracy using the adjusted model (energy 5 vs. 2 d), indicating the need to control for confounders to obtain reliable estimates of intakes.
U Palaniappan; R I Cue; H Payette; K Gray-Donald
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of nutrition     Volume:  133     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-01-06     Completed Date:  2003-02-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  232-5     Citation Subset:  IM    
School of Dietetics and Human Nutrition, McGill University, Canada, H9X 3V9.
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MeSH Terms
Mental Recall
Middle Aged
Nutrition Surveys
Sex Distribution

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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