Document Detail

A practical method for collecting food record data in a prospective cohort study of breast cancer survivors.
MedLine Citation:
PMID:  20937633     Owner:  NLM     Status:  MEDLINE    
Multiple-day diet records can be unsuitable for cohort studies because of high administrative and analytical costs. Costs could be reduced if a subsample of participants were analyzed in a nested case-control study. However, completed records are usually reviewed ("documented") with participants to correct errors and omissions before analysis. The authors evaluated the suitability of using undocumented 3-day food records in 2 samples of women in a Northern California cohort study of breast cancer survivorship (2006-2009). One group of participants (n = 130) received an introduction to the food record at enrollment, while another (n = 70) received more comprehensive instruction. Food records were mailed to participants 6 months later for follow-up and were analyzed as received and after phone documentation. Error rates for adequate completion were high in the first group but substantially lower among persons receiving instruction; prevalences of missing data on serving size and incomplete food descriptions changed from 30% to 4% and from 32% to 6%, respectively (P < 0.0001). Correlations between nutrient intakes calculated from undocumented and documented records were 0.72-0.93 in the first group and were significantly stronger (0.84-0.99) among persons receiving instruction. Documentation had little effect on intraclass correlation coefficients across days, but training increased the coefficients for many nutrients. When participants receive proper instruction, undocumented food records can be satisfactory for large epidemiologic studies.
Marilyn L Kwan; Lawrence H Kushi; Jun Song; Allegra W Timperi; Alanna M Boynton; Karen M Johnson; Judi Standley; Alan R Kristal
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2010-10-11
Journal Detail:
Title:  American journal of epidemiology     Volume:  172     ISSN:  1476-6256     ISO Abbreviation:  Am. J. Epidemiol.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-25     Completed Date:  2010-12-22     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  7910653     Medline TA:  Am J Epidemiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1315-23     Citation Subset:  IM    
Division of Research, Kaiser Permanente Northern California, Oakland, California 94612, USA.
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MeSH Terms
Breast Neoplasms / epidemiology*
California / epidemiology
Cohort Studies
Diet Records
Diet Surveys / methods*
Energy Intake
Follow-Up Studies
Middle Aged
Population Surveillance / methods*
Prospective Studies
Reproducibility of Results
Survivors / statistics & numerical data*
Grant Support
P30 CA15704/CA/NCI NIH HHS; R01 CA105274/CA/NCI NIH HHS; R01 CA105274/CA/NCI NIH HHS

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

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