Document Detail

Portion size adds limited information on variance in food intake of participants in the EPIC-Potsdam study.
MedLine Citation:
PMID:  12566492     Owner:  NLM     Status:  MEDLINE    
Food-frequency questionnaire (FFQ) data should reflect interindividual variation and therefore measure variance in intake among populations. We conducted this analysis to evaluate the relevance of separate portion size questions to the interindividual variation in food intake. The contribution of portion size questions to the variance in food intake was quantified and compared with the variance when group-specific portion sizes would be assigned, using 26,764 FFQ of the European Investigation into Cancer and Nutrition (EPIC)-Potsdam Study. Groups were defined according to gender, age (<50 y, >/=50 y) or body mass index (BMI) (<26 kg/m(2), >/=26 kg/m(2)). The FFQ inquired about both consumption frequency and portion size. Linear regression models for each food item were fit with intake (g/d) as dependent variables and frequency of intake as independent variables. The mean coefficient of determination (R(2)) for the different food items explained by frequency only was 84.0% (71.2-95.7%). The R(2) for gender-, age- and BMI-specific frequencies of intake did not markedly alter the overall results. We conclude that the omission of individual portion size information would probably result in a notable reduction of interindividual variance. However, to reduce the respondents' burden and to increase data completeness in self-administration in large epidemiologic studies, the assignment of a constant portion size seems to be adequate. The variance was not increased markedly when constant gender-, age- and BMI-specific portion sizes were applied, thus supporting the assignment of an overall portion size.
Ute Noethlings; Kurt Hoffmann; Manuela M Bergmann; Heiner Boeing;
Publication Detail:
Type:  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 Feb 
Date Detail:
Created Date:  2003-02-04     Completed Date:  2003-02-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  510-5     Citation Subset:  IM    
German Institute of Human Nutrition, Department of Epidemiology, Bergholz-Rehbruecke, Germany.
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MeSH Terms
Age Distribution
Body Mass Index
Diet Surveys
Middle Aged
Sex Distribution

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