ResearchResearch and Professional BriefComparison between Dietary Assessment Methods for Determining Associations between Nutrient Intakes and Bone Mineral Density in Postmenopausal Women
Section snippets
Study Design and Anthropometry
This is a secondary analysis of cross-sectional data that was collected from the first year of the Bone Estrogen Strength Training study, a blocked, randomized clinical trial. The Bone Estrogen Strength Training study investigated the effect of exercise on BMD in healthy postmenopausal women. Participants were categorized by hormone therapy and then randomized to exercise or control conditions. They were provided with and requested to consume 800 mg calcium in supplemental form each day during
Statistical Methods
All data analyses were performed using the Statistical Package for the Social Sciences (version 11.5, 2002, SPSS Inc, Chicago, IL). Year 1 average nutrient intake values were calculated from estimates of dietary intake alone except for total calcium. Average total calcium intake was calculated as the sum of the mean calcium intakes obtained from the diet records or AFFQs plus mean intakes from the calcium supplements calculated through tablet count compliance.
Dietary intake distributions were
Results and Discussion
Three hundred twenty-one women were enrolled in the primary study. The current investigation excluded participants who had less than 5 days of diet records (n=28), and missing or incomplete AFFQs (n=20). Five participants were excluded for having AFFQ mean energy intake twice that of the diet records. Twenty-four were excluded because they did not have valid dual-energy x-ray absorptiometry measurements. Two hundred forty-four women were included in these analyses.
Mean age of subjects was
Conclusions
This study suggests that both diet records and AFFQs, assessing the same year of dietary intake, provided equivalent estimates of particular nutrient intakes when determining the associations of dietary nutrient intakes with BMD in healthy, postmenopausal women. This analysis showed iron and magnesium were consistently and significantly associated with BMD at all bone sites and zinc, fiber, phosphorous, potassium, calcium, and total calcium were significantly associated with BMD at three or
V. A. Farrell is a senior research specialist, University of Arizona, Tucson
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V. A. Farrell is a senior research specialist, University of Arizona, Tucson
S. B. Going is a professor, University of Arizona, Tucson
C. Thomson is an associate professor, Department of Nutritional Sciences, University of Arizona, Tucson
T. G. Lohman is a professor, Department of Physiology, University of Arizona, Tucson
L. B. Houtkooper is Cooperative Extension associate director, programs, University of Arizona, Tucson
M. Harris is an assistant professor-health specialist, Division of Agriculture Cooperative Extension Service, Family and Consumer Sciences, University of Arkansas, Little Rock
J. L. Weber is an associate professor, Department of Pediatrics, College of Medicine, University of Arkansas, Little Rock