Accepted for Publication: July 12, 2012.
Published Online: December 24, 2012. doi:10.1001/jamapediatrics.2013.432
Author Contributions:Study concept and design: Berry, M. Hall, D. Hall, Kuo, Cohen, Agrawal, and Neff. Acquisition of data: M. Hall, D. Hall, Agrawal, Clifton, and Neff. Analysis and interpretation of data: Berry, M. Hall, D. Hall, Kuo, Cohen, Agrawal, Mandl, Clifton, and Neff. Drafting of the manuscript: Berry, M. Hall, D. Hall, and Clifton. Critical revision of the manuscript for important intellectual content: Berry, D. Hall, Kuo, Cohen, Agrawal, Mandl, and Neff. Statistical analysis: Berry, M. Hall, D. Hall, Kuo, Clifton, and Neff. Obtained funding: Berry. Administrative, technical, and material support: Berry and Clifton. Study supervision: Berry, D. Hall, Cohen, Mandl, and Neff.
Conflict of Interest Disclosures: Dr Neff reports that he is a codeveloper of CRGs and receives a consultation fee from the National Association of Children's Hospitals and Related Institutions for classification research. The Child Health Corporation of America received the CRGs for this analysis from 3M Health Information Systems on a no-cost license.
Funding/Support: This study was supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development career development award K23 HD058092 (Dr Berry), grant 1UL1RR029884 from the National Center for Research Resources (Dr Kuo), and Seattle Children's Hospital (Dr Neff).
Role of the Sponsor: The funders were not involved in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: We thank William Kaplan, BS, for his assistance in preparing the manuscript for submission.