Accepted for Publication: April 14, 2015.
Published Online: July 13, 2015. doi:10.1001/jamapediatrics.2015.1062.
Study concept and design: Comstock, Fields.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Comstock, Grubenhoff, Fields.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Comstock, Currie, Pierpoint.
Obtained funding: Comstock.
Administrative, technical, or material support: Comstock.
Study supervision: Comstock.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded in part by grants R49/CE000674-01 and R49/CE001172-01 from the Centers for Disease Control and Prevention. Research funding was also provided by the National Federation of State High School Associations, National Operating Committee on Standards for Athletic Equipment, DonJoy Orthotics, and EyeBlack.
Role of Funder/Sponsor: The funding sources had no role in the design and conduct of the study; management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: The content of this report is solely the responsibility of the authors and does not necessarily represent the official views of the Centers for Disease Control and Prevention or any of the other institutions that provided financial support for this research.
Additional Contributions: We thank the certified athletic trainers who report data to High School RIO, without whose dedication this research would not be possible.