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Am J Epidemiol 2003; 158:14-21.
Copyright © 2003 by Johns Hopkins Bloomberg School of Public Health


PRACTICE OF EPIDEMIOLOGY

Structure of Dietary Measurement Error: Results of the OPEN Biomarker Study

Victor Kipnis1 , Amy F. Subar2, Douglas Midthune1, Laurence S. Freedman3,4, Rachel Ballard-Barbash2, Richard P. Troiano2, Sheila Bingham5, Dale A. Schoeller6, Arthur Schatzkin7 and Raymond J. Carroll8

1 Biometry Research Group, Division of Cancer Prevention, National Cancer Institute, Bethesda, MD.
2 Applied Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD.
3 Department of Mathematics, Statistics and Computer Science, Bar Ilan University, Ramat Gan, Israel.
4 Gertner Institute for Epidemiology and Health Policy Research, Tel Hashomer, Israel.
5 Medical Research Council, Dunn Human Nutrition Unit, Cambridge, United Kingdom.
6 Department of Nutritional Sciences, University of Wisconsin, Madison, WI.
7 Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD.
8 Department of Statistics, Texas A&M University, College Station, TX.

Multiple-day food records or 24-hour dietary recalls (24HRs) are commonly used as "reference" instruments to calibrate food frequency questionnaires (FFQs) and to adjust findings from nutritional epidemiologic studies for measurement error. Correct adjustment requires that the errors in the adopted reference instrument be independent of those in the FFQ and of true intake. The authors report data from the Observing Protein and Energy Nutrition (OPEN) Study, conducted from September 1999 to March 2000, in which valid reference biomarkers for energy (doubly labeled water) and protein (urinary nitrogen), together with a FFQ and 24HR, were observed in 484 healthy volunteers from Montgomery County, Maryland. Accounting for the reference biomarkers, the data suggest that the FFQ leads to severe attenuation in estimated disease relative risks for absolute protein or energy intake (a true relative risk of 2 would appear as 1.1 or smaller). For protein adjusted for energy intake by using either nutrient density or nutrient residuals, the attenuation is less severe (a relative risk of 2 would appear as approximately 1.3), lending weight to the use of energy adjustment. Using the 24HR as a reference instrument can seriously underestimate true attenuation (up to 60% for energy-adjusted protein). Results suggest that the interpretation of findings from FFQ-based epidemiologic studies of diet-disease associations needs to be reevaluated.

bias (epidemiology); biological markers; diet; energy intake; epidemiologic methods; nutrition assessment; questionnaires; reference values

Abbreviations: Abbreviations: DLW, doubly labeled water; FFQ, food frequency questionnaire; OPEN, Observing Protein and Energy Nutrition; 24HR, 24-hour dietary recall.


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Related articles in Am. J. Epidemiol.:

Using Intake Biomarkers to Evaluate the Extent of Dietary Misreporting in a Large Sample of Adults: The OPEN Study
Amy F. Subar, Victor Kipnis, Richard P. Troiano, Douglas Midthune, Dale A. Schoeller, Sheila Bingham, Carolyn O. Sharbaugh, Jillian Trabulsi, Shirley Runswick, Rachel Ballard-Barbash, Joel Sunshine, and Arthur Schatzkin
Am. J. Epidemiol. 2003 158: 1-13. [Abstract] [FREE Full Text]  

Invited Commentary: OPEN Questions
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Am. J. Epidemiol. 2003 158: 22-24. [Extract] [FREE Full Text]  

Kipnis et al. Respond to "OPEN Questions"
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