Document Detail

The effect of missing data in the supplements to McCance and Widdowson's food tables on calculated nutrient intakes.
MedLine Citation:
PMID:  10557003     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess the degree of underestimation of nutrient intakes caused by missing data in McCance and Widdowson's food tables and supplements, the standard food tables used in the UK. SUBJECTS: 1026 children aged 18 months. SETTING: A research clinic in Bristol. INTERVENTIONS: A 3-day dietary diary was completed for each child. These were coded and analysed using a database consisting of the unedited information in the food tables, to produce a set of 'uncorrected' nutrient intakes. 'Guesstimated' values for nutrient content were then added to our nutrient database in place of the missing values in the food tables, and the daily nutrient intakes were recalculated. MAIN OUTCOME MEASURES: Calculated daily nutrient intakes before and after substituting missing data in the food tables for guesstimated values. RESULTS: Of the 1027 foods used in the analysis, 540 had missing data for one or more nutrient content. For several of the nutrients examined adding guesstimated values altered the calculated nutrient intake of more than 90% of the subjects. However, for nutrients such as the B vitamins and the major minerals the mean percentage underestimate was very small. We calculated the underestimation of nutrient intake to be largest for vitamins E and D (13.8% and 14.7%, respectively). The effect of missing data on calculated nutrient intakes was proportionately greater at the bottom end of the nutrient intake distribution. CONCLUSION: Missing data has a fairly small effect on calculated mean daily intakes. However, it can result in some individuals being misranked within a nutrient intake distribution. The availability of a standard set of 'guesstimates' to use in place of missing data would reduce this problem, and would improve comparability between dietary surveys.
I Cowin; P Emmett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of clinical nutrition     Volume:  53     ISSN:  0954-3007     ISO Abbreviation:  Eur J Clin Nutr     Publication Date:  1999 Nov 
Date Detail:
Created Date:  1999-12-10     Completed Date:  1999-12-10     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8804070     Medline TA:  Eur J Clin Nutr     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  891-4     Citation Subset:  IM    
Division of Paediatric and Perinatal Epidemiology, Institute of Child Health, University of Bristol, Bristol, UK.
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MeSH Terms
Child Nutritional Physiological Phenomena*
Diet Records
Dietary Supplements*
False Negative Reactions
Food Analysis
Great Britain
Iodine / administration & dosage
Selenium / administration & dosage
Reg. No./Substance:
7553-56-2/Iodine; 7782-49-2/Selenium

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