Document Detail

Reproducibility and validity of a food-frequency questionnaire for use among low-income Brazilian workers.
MedLine Citation:
PMID:  14641954     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To assess the reproducibility and validity a 127-item, habitual intake, food-frequency questionnaire (FFQ), developed for low-income and low-literacy Brazilian workers, by comparison with a 24-hour dietary recall (24-HDR).
DESIGN: The FFQ and 24-HDR were interviewer-administered at the local workplace to each subject twice, with a period of 6 months between estimates; and four 24-HDRs were conducted during the 4-month period between the two FFQs (FFQ1 and FFQ2). Reproducibility was tested by comparing mean nutrient intakes from the two FFQs. Validity was determined by comparing the mean nutrient intakes from the FFQs with the corresponding averages of the six 24-HDRs (reference method).
SETTING: Goiânia City, in Central West Brazil.
SUBJECTS: The study was based on 104 (62 women and 42 men) subjects, aged 18 to 60 years, who were randomly selected.
RESULTS: Dietary intake from the FFQ was higher than from the 24-HDR. Reproducibility was assessed by Pearson correlation coefficients for nutrients from FFQ1 and FFQ2, and ranged from 0.23 for retinol to 0.69 for total energy (mean 0.52). Intra-class coefficients for nutrients averaged by the 24-HDRs ranged from 0.29 for vitamin C to 0.76 for total energy; retinol was not significant. In the validation study, correlation between the FFQ and the 24-HDR ranged between 0.21 for vitamin C and 0.70 for total energy (mean 0.50). Adjusting for total energy lowered the coefficients, except for calcium, retinol and vitamin C. Coefficients increased with attenuation, ranging from 0.35 for carbohydrate to 0.65 for calcium.
CONCLUSIONS: Results indicate that this questionnaire had satisfactory reproducibility and reasonable validity.
Nélida Schmid Fornés; Maria Luiza Ferreira Stringhini; Berenice Müller Elias
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Publication Detail:
Type:  Comparative Study; Journal Article; Validation Studies    
Journal Detail:
Title:  Public health nutrition     Volume:  6     ISSN:  1368-9800     ISO Abbreviation:  Public Health Nutr     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-03     Completed Date:  2004-04-16     Revised Date:  2014-07-28    
Medline Journal Info:
Nlm Unique ID:  9808463     Medline TA:  Public Health Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  821-7     Citation Subset:  IM    
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MeSH Terms
Diet Records*
Diet Surveys
Energy Intake
Food Analysis
Food Habits
Interviews as Topic
Middle Aged
Nutrition Assessment*
Nutritive Value
Occupations / classification
Reproducibility of Results

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

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