TABLE 1.

Clinical and biomechanical characteristics of athletes diagnosed with concussion by team medical staff^*

Characteristic	Value
incidence
no. of impacts recorded	486,594
no. of participating athletes	450
no. of diagnosed concussions (40 football, 7 women’s hockey, 1 men’s hockey)	48
no. of athletes w/ concussion diagnosis	44
presenting symptoms/signs
loss of consciousness	1
mental slowing, confusion, “in a fog”	36
headache	29
dizziness	19
neck pain	11
head or neck pain only—no change in mentation	7
identified impact & timing of symptom onset
specific impact event identified by player/observers	31
immediate onset of symptoms	19
delayed onset of symptoms	5
unknown onset of symptoms	7
no specific impact event identified by player/bservers	13
immediate onset of symptoms	5
delayed onset of symptoms	6
unknown onset of symptoms	2
timing of diagnosis
immediate or w/in minutes	8
later same day	19
next day	10
2–4 days	9
prior concussions
none	15
1	13
2	4
3	1
unknown	15
biomechanics
peak linear acceleration (g)
mean	86.1±42.6
range	16.5−177.9
peak angular acceleration (rad/sec2)
mean	3620±2166
range	183−7589

^*Values refer to concussions unless otherwise indicated.