Table 1.

Summary of reported concussion incidence

	Wennberg & Tator (2003)	Meeuwisse, Burke & Benson (2003)	Stevens et al (2008)	Wennberg & Tator (2008)	Benson et al (2011)	Hutchison et al (2013)	Izraelski et al (2013)
	Concussions
Season
1986/1987	Mean: 11.6/season
1987/1988
1988/1989
1989/1990
1990/1991
1991/1992
1992/1993
1993/1994
1994/1995*
1995/1996
1996/1997	Mean: 55.8/season
1997/1998		Mean: 97/season		Mean: 68.8/season	Mean: 80/season
1998/1999
1999/2000
2000/2001
2001/2002			44
2002/2003
2003/2004
2005/2006							Mean:63.8/season
2006/2007						Mean: 74.2/season
2007/2008
2008/2009
2009/2010
2010/2011
2011/2012