Document Detail

Biochemical validation of a self-administered semi-quantitative food-frequency questionnaire.
MedLine Citation:
PMID:  7547847     Owner:  NLM     Status:  MEDLINE    
The present study is a biochemical validation of a food-frequency questionnaire (FFQ) with optical reading, i.e. containing food portion photographs to help to assess quantities. Forty-four healthy subjects, non-smokers and not taking vitamin supplements, were recruited for the study. After completion of the questionnaire, subjects were asked to keep a 7 d weighed dietary record (7DR). Three 24 h urine samples were collected on 3 different days over the week of food recording for the analysis of urea-N, P and K. On the 4th day of food recording, blood was collected for determination of alpha-tocopherol, beta-carotene and ascorbic acid. N, P and K determined in urines and from 7DR were significantly correlated (Spearman rank correlation test), r values being 0.77, 0.57 and 0.42 respectively. The correlations with the FFQ were significant only for N (r 0.45) and P (r 0.39). Blood ascorbic acid and beta-carotene concentrations correlated with dietary intake when determined from 7DR (both r 0.44), but not when determined from FFQ. No correlation was found for alpha-tocopherol. The data obtained seem to prove the validity of the FFQ in defining eating patterns in terms of some nutrients, but not vitamins, at least as far as non-supplemented subjects are concerned. The way in which foods were grouped in the questionnaire could account for these results.
M Porrini; M G Gentile; F Fidanza
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The British journal of nutrition     Volume:  74     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  1995 Sep 
Date Detail:
Created Date:  1995-11-21     Completed Date:  1995-11-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  323-33     Citation Subset:  IM    
Department of Food Science and Microbiology, University of Milan, Italy.
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MeSH Terms
Ascorbic Acid / blood
Carotenoids / blood
Diet Records*
Nitrogen / analysis
Phosphorus / urine
Potassium / urine
Reproducibility of Results
Urea / urine
Vitamin E / blood
beta Carotene
Reg. No./Substance:
1406-18-4/Vitamin E; 36-88-4/Carotenoids; 50-81-7/Ascorbic Acid; 57-13-6/Urea; 7235-40-7/beta Carotene; 7440-09-7/Potassium; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen

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

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