title: National High School Athlete Concussion Rates From 2005-2006 to 2011-2012.
abstract: BACKGROUND
  High school athletes are at risk for concussions. Although a previously published study showed an increase in concussion rates for a single school district, it remains unknown if the rate of concussions among high school athletes is increasing nationally.
  
  
  OBJECTIVE
  To investigate national high school athlete concussion rates over time.
  
  
  METHODS
  Descriptive epidemiologic study.
  
  
  METHODS
  The rate of concussions per 1000 athlete-exposures was calculated for academic years 2005-2006 through 2011-2012 using the High School Reporting Information Online sports injury surveillance system.
  
  
  RESULTS
  During the 7-year period of this study, High School Reporting Information Online captured 4024 concussions with overall concussion diagnosis rates increasing significantly from 0.23 to 0.51 (P = .004). Concussion diagnosis rates increased for each of the 9 sports studied, with 5 sports having statistically significant increases over this 7-year period.
  
  
  CONCLUSIONS
  The study analysis indicates that national concussion diagnosis rates for high school sports have increased significantly over time.
authors.affiliation: Department of Physical Medicine and Rehabilitation, The Ohio State University, Columbus, Ohio, USA joseph.rosenthal@osumc.edu.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Rosenthal
authors.affiliation: Division of Epidemiology, College of Public Health, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Randi E
authors.initials: RE
authors.lastname: Foraker
authors.affiliation: Center for Injury Research and Policy, Research Institute, Nationwide Children's Hospital, Columbus, Ohio, USA.
authors.forename: Christy L
authors.initials: CL
authors.lastname: Collins
authors.affiliation: Colorado School of Public Health, University of Colorado Denver, Aurora, Colorado, USA.
authors.forename: R Dawn
authors.initials: RD
authors.lastname: Comstock
mesh_terms: D000293:Adolescent; D056352:Athletes / Q000706:statistics & numerical data*; D001265:Athletic Injuries / Q000453:epidemiology*; D001924:Brain Concussion / Q000453:epidemiology; D016021:Epidemiologic Studies; D006801:Humans; D008297:Male; D011159:Population Surveillance; D012574:Schools; D013177:Sports / Q000706:statistics & numerical data*; D013334:Students / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology
keywords: athlete; concussion; epidemiology; high school