Author Contributions: Dr Taylor had full access
to all of the data in the study and takes responsibility for the integrity
of the data and the accuracy of the data analyses.
Study concept and design: Taylor, Curhan.
Acquisition of data; analysis and interpretation of
data; critical revision of the manuscript for important intellectual content;
statistical analysis: Taylor, Stampfer, Curhan.
Drafting of the manuscript: Taylor.
Obtained funding; administrative, technical, or material
support; study supervision: Stampfer, Curhan.
Funding/Support: This study was funded by grants
DK 59583, DK 07791, CA 87969, CA 55075, and CA 50385 from the National Institutes
Role of the Sponsor: The National Institutes
of Health had no role in the design and conduct of the study; the collection,
analysis, or interpretation of the data; or the preparation, review, or approval
of the manuscript.
Previous Presentations: Part of this work was
presented at the 10th International Symposium on Urolithiasis; May 25-28,
2004; Hong Kong; and at the 2004 annual meeting of the American Society of
Nephrology; October 27-November 1, 2004; St Louis, Mo.
Acknowledgment: We thank Elaine M. Coughlan
for technical support and Walter C. Willett, MD, DrPH, for advice regarding
analysis and interpretation of the data. We also thank Melissa J. Francis,
Christine Jones, and Adam Summerfield for assistance with data acquisition