Document Detail

Biochemical markers as additional measurements in studies of the accuracy of dietary questionnaire measurements: conceptual issues.
MedLine Citation:
PMID:  9094927     Owner:  NLM     Status:  MEDLINE    
Studies of the accuracy of questionnaire measurements of habitual dietary intakes of individuals are generally based on a comparison with replicate weighed-food consumption records or 24-h recalls used as reference measurements. The correlation between the questionnaire measurements (Q) and the subjects' true long-term intake (T) of foods or nutrients (rho QT) is then estimated from the observed correlation with mean reference measurements, with correction for attenuating effects due to random errors in the reference measurements themselves. For this approach to be valid, it is crucial that these random errors are uncorrelated between questionnaire and reference measurements and between replicate reference measurements. In practice, however, these two criteria are not always fulfilled and rho QT may be systematically overestimated or underestimated. The advantage of using biochemical markers in dietary assessments is that there is often little reason to doubt that their random errors are truly independent of those of both questionnaire measurements and food-consumption records. Thus, the inclusion of such markers in dietary validity studies can make it more likely that the criteria of independent errors, crucial in validity studies, are met.
R J Kaaks
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  65     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  1997 Apr 
Date Detail:
Created Date:  1997-04-30     Completed Date:  1997-04-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1232S-1239S     Citation Subset:  AIM; IM    
International Agency for Research on Cancer, Lyon, France.
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MeSH Terms
Biological Markers / analysis*
Mental Recall
Models, Statistical
Nutrition Assessment*
Reg. No./Substance:
0/Biological Markers

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