Published Online: September 12, 2013. doi:10.1001/jama.2013.277915.
Study concept and design: Nicholas, Dimick.
Acquisition of data: Dimick.
Analysis and interpretation of data: Nicholas, Dimick.
Drafting of the manuscript: Nicholas, Dimick.
Critical revision of the manuscript for important intellectual content: Nicholas, Dimick.
Statistical analysis: Nicholas, Dimick.
Obtained funding: Dimick.
Administrative, technical, or material support: Nicholas, Dimick.
Study supervision: Nicholas, Dimick.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Nicholas reported membership in the National Academy of Social Insurance and receiving institutional grants from the Russell Sage Foundation and the Commonwealth Fund. This Research Letter was completed while Dr Nicholas was based at the Institute for Social Research, University of Michigan. Dr Dimick reported serving as a consultant and board member for, and having equity interest in, ArborMetrix Inc, which provides software and analytics for measuring hospital quality and efficiency but had no role in this study.
Funding/Support: This study was supported by a National Institute on Aging grant R01AG039434 (Nicholas, Dimick). Dr Nicholas is supported by career development award K01AG04173 from the National Institute on Aging. Dr Dimick is supported by career development award K08HS017765 from the Agency for Healthcare Research and Quality.
Role of the Sponsors: The funders had no role in the design and conduct of the study; the collection, management, analysis, and interpretation of the data; the preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Disclaimer: The views expressed in this Research Letter do not necessarily represent the those of the US government.