Author Contributions: Dr Iwashyna 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: Iwashyna, Ely, Langa.
Acquisition of data: Langa.
Analysis and interpretation of data: Iwashyna, Ely, Smith, Langa.
Drafting of the manuscript: Iwashyna, Ely, Langa.
Critical revision of the manuscript for important intellectual content: Iwashyna, Ely, Smith, Langa.
Statistical analysis: Iwashyna, Ely, Smith, Langa.
Obtained funding: Iwashyna.
Administrative, technical, or material support: Iwashyna, Ely, Langa.
Study supervision: Iwashyna, Ely, Langa.
Financial Disclosures: None reported.
Funding/Support: This work was supported by grants K08 HL091249, R01 AG027010, and R01 AG030155 from the National Institutes of Health; the Society of Critical Care Medicine's 2010 Vision Grant; and by pilot support from grant UL1RR024986 from the Michigan Institute for Clinical and Health Research. Grant U01 AG09740 from the National Institute on Aging provided funding for the Health and Retirement Study, which is performed at the Institute for Social Research, University of Michigan. Dr Ely was supported by grant AG027472 from the National Institutes of Health, by the Veterans Affairs Merit Award, and by the Tennessee Valley Geriatric Research, Education and Clinical Center. Consultative support was provided by the Measurement Core of the Michigan Diabetes Center through grant P60 DK-20572 from the National Institute of Diabetes and Digestive and Kidney Disease.
Role of the Sponsor: The funders played no role in the design, interpretation, or decision to publish the analysis presented herein.
Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the Department of Veterans Affairs or the US government.
Additional Contributions: We thank Mohamed Kabeto, MS, Ryan McCammon, AB, Lili Deng, MD, MA, and Tish Shapiro, MA, all at the University of Michigan, for their expert programming; they were financially compensated for their work. We further thank Robert Hyzy, MD, and Rodney Hayward, MD, of the University of Michigan for insightful critiques; they received no compensation for their work.