24-Hour national dietary survey data : how do we interpret them most effectively?

Mackerras, Dorothy and Rutsihauser, Ingrid 2005, 24-Hour national dietary survey data : how do we interpret them most effectively?, Public health nutrition, vol. 8, no. 6, pp. 657-665, doi: 10.1079/PHN2005720.

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Title 24-Hour national dietary survey data : how do we interpret them most effectively?
Author(s) Mackerras, Dorothy
Rutsihauser, Ingrid
Journal name Public health nutrition
Volume number 8
Issue number 6
Start page 657
End page 665
Publisher Cambridge University Press
Place of publication Cambridge, England
Publication date 2005
ISSN 1368-9800
Keyword(s) dietary assessment
estimated average requirement
recommended dietary intake
within-person variance
Summary Objective To illustrate the effect of common mistakes when using 24-hour national dietary survey data to estimate the prevalence of inadequate nutrient intakes.

Design Raw data on nutrient intake from the Australian 1995 National Nutrition Survey were adjusted for within-person variance using standard techniques and corrected for underreporting using the criteria of Goldberg et al. The distributions for six nutrients were compared with current dietary reference values from the UK, USA and Australia.

Setting A national sample of the Australian population with a 61.4% response rate.

Results Adjusting for within-person variance reduced the range of nutrient intakes to 66–80% of the raw data range and the proportion with intakes below the estimated average requirement (EAR) by up to 20%. Excluding underreporters further reduced the proportion below the EAR by up to 10%. Using the dietary reference values from different countries also resulted in some markedly different estimates. For example, the prevalence of low folate intakes ranged from <1 to 92% for adult women depending on the reference used. Except for vitamin A and protein, the prevalence of low intakes was invariably higher for women than for men.

Conclusions Estimates of the prevalence of low nutrient intakes based on raw 24-hour survey data are invariably misleading. However, even after adjustment for within-person variance and underreporting, estimates of the prevalence of low nutrient intakes may still be misleading unless interpreted in the light of the reference criteria used and supported by relevant biochemical and physiological measures of nutritional status.
Language eng
DOI 10.1079/PHN2005720
Field of Research 111199 Nutrition and Dietetics not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008843

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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