Document Detail

The reliability of dietary data for self- and next-of-kin respondents.
MedLine Citation:
PMID:  11988417     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: In case-control studies, recalled dietary data from next-of-kin are sometimes used as a surrogate measure of exposure; however, there is limited evidence comparing the ability of study participants and next-of-kin surrogates for the reliability of their responses with respect to past dietary recall. METHODS: We compared dietary information from 303 subjects who were administered a food frequency questionnaire in 1980 with that from 196 of the same subjects and 107 next-of-kin of deceased subjects 5 years later, but with reference to 1980 diet. Agreement between 1980 and 1985 reporting with respect to food groups, food preparation methods, and adherence to special diets was primarily assessed using the kappa statistic. RESULTS: The concordance between 1980 and 1985 reporting of specific food groups was generally poor. Regarding various methods of cooking meats and the use of different types of cooking fats, next-of-kin respondents showed very poor agreement with the reporting of their deceased relatives, and within-subject agreement was also poor for frying meats, baking meats, and for cooking with margarine and vegetable oil. Subjects and next-of-kin were able to reproduce earlier reporting of a special ulcer diet, but not diabetic or low-salt diets. Overall, subjects tended to have better agreement with their own earlier reporting than did next-of-kin, and spouses were found to be more reliable next-of-kin respondents than other relatives. CONCLUSIONS: Dietary data collected retrospectively from next-of-kin may be unreliable.
Jon P Fryzek; Loren Lipworth; Lisa B Signorello; Joseph K Mclaughlin
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Annals of epidemiology     Volume:  12     ISSN:  1047-2797     ISO Abbreviation:  Ann Epidemiol     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-03     Completed Date:  2002-06-07     Revised Date:  2008-06-23    
Medline Journal Info:
Nlm Unique ID:  9100013     Medline TA:  Ann Epidemiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  278-83     Citation Subset:  IM    
International Epidemiology Institute, Rockville, MD 20850, USA.
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MeSH Terms
Case-Control Studies
Diet Surveys*
Food Habits
Kidney Neoplasms / epidemiology*,  mortality
Mental Recall*
Middle Aged
Minnesota / epidemiology
Reproducibility of Results

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

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