Am J Epidemiol 2003; 158:25-26.
Copyright © 2003 by Johns
Hopkins Bloomberg School of Public Health
PRACTICE OF EPIDEMIOLOGY |
Kipnis et al. Respond to "OPEN Questions"
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 Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD.
4 Department of Nutritional Sciences, University of Wisconsin, Madison, WI.
5 Medical Research Council, Dunn Human Nutrition Unit, Cambridge, United Kingdom.
6 Department of Mathematics, Statistics and Computer Science, Bar Ilan University, Ramat Gan, Israel.
7 Gertner Institute for Epidemiology and Health Policy Research, Tel Hashomer, Israel.
Received for publication March 28, 2003; accepted for publication April 3, 2003.
Abbreviations: Abbreviations: DHQ, Diet History Questionnaire; FFQ, food frequency questionnaire; OPEN, Observing Protein and Energy Nutrition; 24HR, 24-hour dietary recall.
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We respond briefly to several important and challenging points raised by Dr. Willett (1) concerning our papers published in this issue of the Journal (2, 3). First, he notes our use of only 2 days of 24-hour dietary recalls (24HRs) per participant, whereas "usual questionnaire validation studies" (1, p. 22) use many more days. We emphasize that only two independent repeat measurements are required, and in many cases are optimal, for unbiased estimation of within-person variation in dietary report instruments or biomarkers (4).
Second, Dr. Willett’s
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Related articles in Am. J. Epidemiol.:
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- 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] - Structure of Dietary Measurement Error: Results of the OPEN Biomarker Study
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Am. J. Epidemiol. 2003 158: 14-21.[Abstract] [FREE Full Text] - Invited Commentary: OPEN Questions
- Walter Willett
Am. J. Epidemiol. 2003 158: 22-24.[Extract] [FREE Full Text]
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