Document Detail

The effect of personal characteristics on the validity of nutrient intake estimates using a food-frequency questionnaire.
MedLine Citation:
PMID:  16684392     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess validity of the Nambour food-frequency questionnaire (FFQ) relative to weighed food records (WFRs), and the extent to which selected demographic, anthropometric and social characteristics explain differences between the two dietary methods. DESIGN: Inter-method validity study; 129-item FFQ vs. 12 days of WFR over 12 months. SETTING: Community-based Nambour Skin Cancer Prevention Trial. SUBJECTS: One hundred and fifteen of 168 randomly selected participants in the trial (68% acceptance rate) aged 25-75 years. RESULTS: Spearman correlations between intakes from the two methods ranged from 0.18 to 0.71 for energy-adjusted values. Differences between FFQ and WFR regressed on personal characteristics were significantly associated with at least one characteristic for 16 of the 21 nutrients. Sex was significantly associated with differences for nine nutrients; body mass index (BMI), presence of any medical condition and age were each significantly associated with differences for three to six nutrients; use of dietary supplements and occupation were associated with differences for one nutrient each. There was no consistency in the direction of the significant associations. Regression models explained from 7% (riboflavin) to 27% (saturated fat) of variation in differences in intakes. CONCLUSIONS: The relative validity of FFQ estimates for many nutrients is quite different for males than for females. Age, BMI, medical condition and level of intake were also associated with relative validity for some nutrients, resulting in the need to adjust intakes estimates for these in modelling diet-disease relationships. Estimates for cholesterol, beta-carotene equivalents, retinol equivalents, thiamine, riboflavin and calcium would not benefit from this.
Geoffrey C Marks; Maria Celia Hughes; Jolieke C van der Pols
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies    
Journal Detail:
Title:  Public health nutrition     Volume:  9     ISSN:  1368-9800     ISO Abbreviation:  Public Health Nutr     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-10     Completed Date:  2006-10-26     Revised Date:  2010-03-23    
Medline Journal Info:
Nlm Unique ID:  9808463     Medline TA:  Public Health Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  394-402     Citation Subset:  IM    
Queensland Institute of Medical Research, Herston, Queensland 4029, Australia.
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MeSH Terms
Age Distribution
Body Mass Index
Confidence Intervals
Diet Records
Diet Surveys
Health Status*
Middle Aged
Nutrition Assessment*
Odds Ratio
Questionnaires / standards*
Reproducibility of Results
Sensitivity and Specificity
Sex Distribution
Statistics, Nonparametric

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

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