Author Contributions: Drs Ogden and Flegal had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Ogden, Curtin, Tabak, Flegal.
Acquisition of data: McDowell.
Analysis and interpretation of data: Ogden, Carroll, Curtin, Flegal.
Drafting of the manuscript: Ogden, Flegal.
Critical revision of the manuscript for important intellectual content: Ogden, Carroll, Curtin, McDowell, Tabak, Flegal.
Statistical analysis: Ogden, Carroll, Curtin, Flegal.
Financial Disclosures: None reported.
Funding/Support: This study was not supported by external funding.
Role of the Sponsor: The US Centers for Disease Control and Prevention (CDC) reviewed and approved this article before submission.
Acknowledgment: We acknowledge William H. Dietz, MD, PhD, Division of Nutrition and Physical Activity, CDC, for critical comments on the manuscript; Barry I. Graubard, PhD, Biostatitstics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, for statistical consultation; Clifford L. Johnson, MSPH, Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, CDC, for study supervision; and Sylvia Tan, MS, Harris Corp and National Center for Health Statistics, CDC, for her computer programming support.