Author Contributions: Dr Coresh 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 analysis.
Study concept and design: Coresh, Selvin.
Acquisition of data: Coresh, Selvin, Manzi, Stevens, Eggers, Van Lente.
Analysis and interpretation of data: Coresh, Selvin, Stevens, Manzi, Kusek, Eggers, Levey.
Drafting of the manuscript: Coresh, Selvin.
Critical revision of the manuscript for important intellectual content: Coresh, Selvin, Stevens, Manzi, Kusek, Eggers, Van Lente, Levey.
Statistical analysis: Coresh, Selvin.
Obtained funding: Coresh, Kusek, Eggers, Levey.
Administrative, technical, or material support: Stevens, Eggers, Van Lente, Levey.
Study supervision: Coresh, Levey.
Financial Disclosures: None reported.
Funding/Support: The research for this study was supported by grants UO1 DK 053869, UO1 DK 067651, and UO1 DK 35073 from the National Institute of Diabetes and Digestive and Kidney Diseases. Dr Selvin was supported by grant K01 DK076595 from the National Institute of Diabetes and Digestive and Kidney Diseases.
Role of the Sponsor: Two of the coauthors, Drs Kusek and Eggers, are employees of the National Institute of Diabetes and Digestive and Kidney Diseases. The National Institute of Diabetes and Digestive and Kidney Diseases had no input into the data collection, conduct, or management of the study. The National Institute of Diabetes and Digestive and Kidney Diseases staff commented on the analysis, interpretation of the data, preparation, and review; and approved the manuscript. The National Health and Nutrition Examination Surveys were conducted by the US Centers for Disease Control and Prevention.
Previous Presentation: This study was presented in part at the American Society of Nephrology; November 2, 2007; San Francisco, California.
Additional Contributions: We thank the National Center of Health Statistics for the data collection, Geraldine McQuillan, PhD, and David A. Lacher, MD, MEd, for the laboratory calibration studies, and Lester R. Curtin, PhD, for advice on combining weights across surveys. None of the individuals listed herein received any compensation. All 3 work for the National Center for Health Statistics, Hyattsville, Maryland.