Document Detail


Method issues in dietary data analyses in the Multiple Risk Factor Intervention Trial.
MedLine Citation:
PMID:  8988939     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The selection process in the Multiple Risk Factor Intervention Trial caused relations between risk factors to differ between participants who were randomly assigned into the study and the screening population. Cigarette smoking, blood pressure, and serum cholesterol were moderately inversely related to each other in the randomly assigned population whereas these relations in the unselected population were direct and small in magnitude. This problem was addressed by covariate adjustment in analyses. The selection process also created an artificially high initial mean concentration of serum cholesterol; the mean plasma concentration at the second screening was 15 mg/dL lower than at the first screening. Most of this difference is attributable to regression to the mean. To account for this problem, emphasis was placed on change in plasma cholesterol over time, calculated from the second-screening measurement. Examination of the reliability of nutrition data based on one 24-h dietary recall showed that nutrient-biochemical relations are subject to considerable regression-dilution bias. The ratios of "within" to "between" components of variability were typically between one and four. Analyses in which multiple follow-up measures were averaged are emphasized in this monograph. Men assigned to the special intervention group reported considerable reductions in total energy intake, which was not consistent with observed weight loss. The most likely explanation for this is underreporting or underconsumption the day before the recall. To partially adjust for this, nutrient data are often expressed both in absolute units and as nutrient densities.
Authors:
G A Grandits; G E Bartsch; J Stamler
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  65     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-01-28     Completed Date:  1997-01-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  211S-227S     Citation Subset:  AIM; IM    
Affiliation:
Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis 55414, USA.
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MeSH Terms
Descriptor/Qualifier:
Cholesterol / blood
Diet*
Energy Intake
Humans
Intervention Studies
Male
Mental Recall
Nutrition Surveys*
Risk Factors
Smoking
Chemical
Reg. No./Substance:
57-88-5/Cholesterol

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


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