Open Access Research

Repeatability and measurement error in the assessment of choline and betaine dietary intake: the Atherosclerosis Risk in Communities (ARIC) Study

Aurelian Bidulescu1*, Lloyd E Chambless2, Anna M Siega-Riz3,4, Steven H Zeisel4 and Gerardo Heiss3

1 Cardiovascular Research Institute and Department of Community Health and Preventive Medicine, Morehouse School of Medicine, Atlanta, GA, USA

2 Department of Biostatistics, School of Public Health, University of North Carolina, Chapel Hill, NC, USA

3 Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, NC, USA

4 Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill, NC, USA

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Nutrition Journal 2009, 8:14 doi:10.1186/1475-2891-8-14

Published: 20 February 2009

Additional files

Additional File 1:

Measurement error model and variance-covariance matrix. The description provided represents the algorithms used to construct the measurement error mixed model and to obtain the variance-covariance matrix for the related dietary nutrients.

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