Document Detail

Dietary fiber intake: assessing the degree of agreement between food frequency questionnaires and 4-day food records.
MedLine Citation:
PMID:  17031005     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess the degree of agreement (comparability) between dietary fiber intakes reported on a food frequency questionnaire (FFQ) with 4-day food records (4DFR) and determine whether demographic, behavioral and biological factors influence comparability. METHODS: At baseline and year one, all participants in the Polyp Prevention Trial (PPT), a multi-center randomized, clinical trial of a low-fat, high fiber, high fruit/vegetable eating plan and recurrence of large bowel adenomatous polyps were instructed in dietary assessment and completed a 106-item FFQ and 4DFR that trained nutritionists reviewed. A random sub-cohort of participants (n = 399) was selected from the intervention and control arms of the PPT for analysis of both FFQ and 4DFR. RESULTS: Baseline crude and energy-adjusted fiber intakes were significantly higher in the 4DFR than the FFQ (P = 0.001). Using Bland-Altman statistics, the mean difference (FFQ-4DFR) was -0.11 g/MJ; while the limits of agreement were -1.45, 1.23 g/MJ. The mean fiber difference increased with increasing average intake (FFQ + 4DFR)/2, (P = 0.004) for men, but not women (P = 0.10), suggesting that fiber intake was under-estimated in the FFQ, relative to the 4-DFR, for men with low fiber intakes and over-estimated for men with high intakes. Smoking and gender significantly influenced the average intake at baseline, whereas other demographic and behavioral factors did not. Education was significantly associated with average difference in fiber intake at baseline, but not at year 1. CONCLUSIONS: This study of clinical trial volunteers revealed differences in the ability to comparably report fiber intake across tools by gender, smoking, and education, however participants' repeated training in dietary assessment improved comparability in reporting over time.
Tamaro S Hudson; Michele R Forman; Marie M Cantwell; Arthur Schatzkin; Paul S Albert; Elaine Lanza
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Publication Detail:
Type:  Journal Article; Multicenter Study; Randomized Controlled Trial; Validation Studies    
Journal Detail:
Title:  Journal of the American College of Nutrition     Volume:  25     ISSN:  0731-5724     ISO Abbreviation:  J Am Coll Nutr     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-10-10     Completed Date:  2007-01-09     Revised Date:  2008-06-23    
Medline Journal Info:
Nlm Unique ID:  8215879     Medline TA:  J Am Coll Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  370-81     Citation Subset:  IM    
Division of Cancer Prevention, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-8329, USA.
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MeSH Terms
Aged, 80 and over
Colonic Polyps / prevention & control
Diet Records*
Dietary Fiber / administration & dosage*
Educational Status
Food Habits
Middle Aged
Nutrition Assessment*
Nutritional Sciences / education
Questionnaires / standards*
Reproducibility of Results
Sensitivity and Specificity
Sex Distribution

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

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