Author Contributions: Dr Klein 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: Klein, Kramer, Rivara, Gibran, Concannon.
Acquisition of data: Klein, Kramer, Nelson, Concannon.
Analysis and interpretation of data: Klein, Kramer, Nelson, Concannon.
Drafting of the manuscript: Klein.
Critical revision of the manuscript for important intellectual content: Klein, Kramer, Nelson, Rivara, Gibran, Concannon.
Statistical analysis: Klein, Kramer, Nelson, Concannon.
Obtained funding: Klein.
Administrative, technical, or material support: Klein, Kramer, Nelson, Concannon.
Study supervision: Klein, Concannon.
Financial Disclosures: None reported.
Funding/Support: This work was supported by the National Center for Research Resources grant 1KL2RR025015-01, Harborview Injury Prevention and Research Center (HIPRC) grant R49/CE000197 from the Centers for Disease Control and Prevention, and by the David and Nancy Auth-Washington Research Foundation Endowment.
Role of the Sponsor: The study sponsors had no role in the design and conduct of the study; in the collection, analysis, management, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: Dr Rivara, an editorial board member for JAMA, was not involved in the editorial review of or decision to publish this article.