Accepted for Publication: November 15, 2013.
Published Online: April 7, 2014. doi:10.1001/jamapediatrics.2013.5387.
Study concept and design: Ouimet, Brown, Klauer, Simons-Morton, Lee, Dingus.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Ouimet, Brown.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Guo, Fang.
Obtained funding: Brown, Klauer, Simons-Morton, Lee, Dingus.
Administrative, technical, or material support: Brown, Klauer, Simons-Morton, Lee, Gianoulakis, Dingus.
Study supervision: Ouimet, Klauer, Simons-Morton, Lee, Dingus.
Conflict of Interest Disclosures: None reported.
Funding/Support: This research was supported by the Intramural Research Program of the National Institutes of Health (grant N01-HD-5-3405) and by the National Highway Traffic Safety Administration. Cortisol sampling kits and analyses were provided by the Douglas Hospital Research Centre. Dr Ouimet was supported through a career grant from the Quebec Health Research Fund (Fonds de recherche du Québec–Santé).
Role of the Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: We thank the following persons for their help: Jennifer Mullen, AAS candidate, Virginia Tech Transportation Institute (VTTI), for project management and data collection; Julie McClafferty, MSc, VTTI, for management of data coding; Allen Belsheim, MSc, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), for statistical programming; Sophie Couture, PhD, Douglas Hospital Research Centre, for help in the implementation of the cortisol protocol; Erik C. B. Olsen, PhD, NICHD, for collecting the cortisol samples; and Li Bai, MSc, Douglas Hospital Research Centre, for analysis of the cortisol samples. The people who provided help for this study were either employees or graduate or postdoctoral students of the listed agencies. As such, they received a salary/stipend for their assistance.