Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (4)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by BRANDT, P. A V. D.
Right arrow Articles by TANNENBAUM, S. R
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by BRANDT, P. A V. D.
Right arrow Articles by TANNENBAUM, S. R
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 1989 Oxford University Press

research-article

Assessment of Dietary Nitrate Intake by a Self-Administered Questionnaire and by Overnight Urinary Measurement

PIET A VAN DEN BRANDT*, WALTER C WILLETT** and STEVEN R TANNENBAUM{dagger}

* Department of Epidemiology, University of Limburg, Maastricht The Netherlands.
** Departments of Epidemiology and Nutrition, Harvard School of Public Health and Channing Laboratory and Brigham and Women's Hospital Boston, USA.
{dagger} Department of Applied Biological Sciences, Massachusetts Institute of Technology Cambridge, USA.

Van den Brandt P A (Department of Epidemiology, University of Limburg Maastricht, The Netherlands) Willett W C and Tannenbaum S R. Assessment of dietary nitrate intake by a self-administered questionnaire and by overnight urinary measurement. International Journal of Epidemiology, 1989, 18: 852–857.

The relationship between dietary intake and urinary excretion of nitrate was investigated among 35 male and 24 female graduate students in Boston. The dietary assessment method consisted of a self-administered semi-quantitative food frequency questionnaire currently used for large-scale epidemiological studies. Calculated mean daily nitrate intake was 1.83 mmol for men and 2.96 mmol for women; broccoli and green leafy vegetables accounted for 60% of the total. Urinary measurements involved two overnight specimens with a mean collection time of approximately 13 hours. The ratio of intra-to-inter individual variance in urinary nitrate excretion (lambda) was 1.87. The simple correlation coefficient between intake and excretion of nitrate was found to be 0.20; after correction for the within-person variation by using lambda, the correlation coefficient was 0.28. Adjustment for gender, age and Quetelet's Index in multiple regression analyses resulted in a partial correlation coefficient between nitrate intake and excretion of 0.37 (p = 0.005). Correction for within-person variation in urinary excretion increased this partial correlation coefficient between intake and excretion to 0.59 (95% CI = 0.03 to 0.87). These data suggest that a self-administered questionnaire may provide useful information on usual nitrate intake, and indicate the need to pursue this possibility further.

Revised 1 March 1989


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.