Correction: This article was corrected online June 21, 2016, to fix incorrect wording in the Results section of the text and data transcription errors in Tables 3 and 4 that occurred when these Tables were split.
Study concept and design: Zemek, Barrowman, Freedman, Gravel, Gagnon, McGahern, Sangha, Boutis, Craig, Burns, Farion, Mikrogianakis, Barlow, Giola, Meehan, Kamil, Hoshizaki, Anderson, Klassen, Richer, DeMatteo, Osmond.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Zemek, Barrowman, Aglipay, Burns, Farion, Mikrogianakis, Grool, Brooks, Yeates, Keightley, Richer, Osmond.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Zemek, Barrowman, Aglipay, Yeates, Keightley.
Obtained funding: Zemek, Freedman, Gravel, Gagnon, Boutis, Farion, Barlow, Richer, Osmond.
Administrative, technical, or material support: Zemek, Gravel, Gagnon, McGahern, Sangha, Boutis, Craig, Farion, Mikrogianakis, Barlow, Giola, Meehan, Beauchamp, Kamil, Grool, Anderson, Brooks, Vassilyadi.
Study supervision: Zemek, Freedman, Gagnon, McGahern, Sangha, Boutis, Craig, Dubrovsky, Hoshizaki, Anderson, Klassen, Keightley, Osmond.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Gioia reported being the author of the Postconcussion Symptom Inventory (PCSI); the PCSI is freely available and he receives no financial benefit for its use. Dr Meehan reported receiving royalties from ABC-Clio publishing for Kids, Sports, and Concussion: A Guide for Coaches and Parents and from Wolters-Kluwer for being an author for UpToDate; being under contract with ABC-Clio publishing and Springer International for future books; and receiving research funding from the National Football League Players Association and the National Hockey League Alumni Association through the Corey C. Griffin Pro-Am Tournament. No other disclosures were reported.
Funding/Support: This study was supported by operating grant 126197 from the Canadian Institutes of Health Research; grant TM1:#127047 from the Canadian Institutes of Health Research–Ontario Neurotrauma Foundation Mild Traumatic Brain Injury Team; and planning grant MRP: #119829 from the Canadian Institutes of Health Research. Dr Freedman is supported by the Alberta Children’s Hospital Foundation Professorship in Child Health and Wellness.
Role of the Funder/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.
Group Information: Pediatric Emergency Research Canada Concussion (PERC) Team members: Jialing Xie, MD, and Jennifer Chatfield, MN (Alberta Children’s Hospital, Calgary, Canada); Nadia Dow, BA (Stollery Children’s Hospital, Edmonton, Alberta, Canada); Rena Papadimitropoulos, MSc, and Tracey Levesque, RN (Winnipeg Children’s Hospital, Winnipeg, Manitoba, Canada); Cindy Langford, RN (Children’s Hospital of Western Ontario, London, Canada); Tinh Trung Tran, NRP (Hospital for Sick Children, Toronto, Ontario, Canada); Candice McGahern, BA (Children’s Hospital of Eastern Ontario, Ottawa, Canada); Vanessa DiGirolamo, RT, and Joanna Mazza, BSc (Montreal Children’s Hospital, Montreal, Quebec, Canada); Maryse Lagacé, RN, and Ramona Cook, RN (Centre Hospitalier Universitaire Sainte Justine, Montreal, Quebec, Canada); and Eleanor Fitzpatrick, MN, Jessica MacIntyre, MSc, and Jill Moore, MSc (IWK Children’s Hospital, Halifax, Nova Scotia, Canada).
Previous Presentation: The derivation cohort results were presented at the Pediatric Academic Societies Annual Meeting; April 26, 2015; San Diego, California.
Additional Contributions: We thank the parents and children who participated in this study. We appreciate the collaboration of the treating physicians and the research assistants at each site. We are grateful to Pediatric Emergency Research Canada Network for making this study possible.