Author Contributions: Drs Newman and Boudreau and Ms Naydeck 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: Newman, Simonsick, Kritchevsky, Nevitt, Pahor, Studenski.
Acquisition of data: Newman, Simonsick, Naydeck, Kritchevsky, Nevitt, Pahor, Satterfield, Harris.
Analysis and interpretation of data: Newman, Simonsick, Naydeck, Boudreau, Kritchevsky, Nevitt, Pahor, Brach, Studenski.
Drafting of the manuscript: Newman, Naydeck, Nevitt.
Critical revision of the manuscript for important intellectual content: Newman, Simonsick, Naydeck, Boudreau, Kritchevsky, Nevitt, Pahor, Satterfield, Brach, Studenski, Harris.
Statistical analysis: Newman, Simonsick, Naydeck, Boudreau.
Obtained funding: Newman, Kritchevsky, Nevitt, Harris.
Administrative, technical, or material support: Newman, Simonsick, Naydeck, Pahor, Satterfield, Harris.
Study supervision: Kritchevsky.
Financial Disclosures: None reported.
Funding/Support: This study was supported in part by the Intramural Research Program of the National Institutes of Health, National Institute on Aging (NIA), and contracts N01-AG-6-2101, N01-AG-6-2103, and N01-AG-6-2106.
Role of the Sponsor: This study was funded by contracts from the NIA. The NIA scientists had substantial involvement in the study design, data collection, analysis, interpretation, and manuscript preparation.
Acknowledgment: We thank Michelle E. Utz-Kiley, research assistant, University of Pittsburgh, Department of Epidemiology, for her assistance with manuscript preparation.
This article was corrected on 5/15/06, prior to publication of the correction in print.