Table 2.

Median [25–75% interquartile range] number of head impacts for individual players sustaining at least one diagnosed concussion on days with and without injury diagnosis. Athletes sustained more total impacts and more impacts with high kinematic response (top 50^th and 95^th percentile) impacts on days with diagnosed concussion than days without diagnosed concussion.

Number of Daily Head Impacts	Clinical Diagnosis		P Value
	No Concussion	Concussion
> Linear 95% a	0.7 [0.4 – 1.2]	2.0 [1.0 – 3.0]	< 0.001
> Rotational 95% b	0.5 [0.3 – 0.8]	1.0 [1.0 – 2.0]	< 0.001
> Linear 50% a	7.2 [4.6 – 10.2]	10.0 [6.0 – 18.8]	< 0.001
> Rotational 50% b	5.9 [3.7–7.9]	9.0 [4.3 – 16.0]	< 0.001
All Impacts	13.8 [9.4 – 18.9]	21.0 [12.0 – 36.8]	< 0.001

^a50^th and 95^th percentile linear acceleration = 20.5 and 62.2 g

^b50^th and 95^th percentile rotational acceleration = 981 and 2,975 rad/s²