Table 3

Head impact statistics in the 22 participants in the non-collar group and 24 participants in the collar group who underwent both pre-season and post-season MRI

	Non-collar (n=22)				Collar (n=24)
	Range	Median	Mean	SD	Range	Median	Mean	SD
Total hits
>10g	161–1717	571	654	395	242–945	541	566	200
>20g	45–404	117	159	93	78–327	138	157	60
>50g	3–58	20	26	16	12–53	24	25	9
>100g	0–9	2	3.2	2.6	0–8	3.5	3.3	1.9
Total g-force
>10g	3638–27001	9725	12 244	6813	5050–19124	10 713	11 142	4624
>20g	1718–14 335	4411	5825	3338	2882–11901	5214	5752	2074
>50g	273.5–3981	1485	1900	1139	737–3780	1660	1867	697
>100g	0–1090	241.1	406.8	337.3	0–1028.3	425.8	400.5	244.7
Average g-force
>10g	14.06–23.00	18.89	19.23	2.34	15.77–24.47	20.28	20.02	2.08
>20g	31.40–40.25	37.37	36.57	2.48	30.90–42.20	36.59	36.87	2.51
>50g	66.10–91.18	75.04	74.93	6.44	61.44–91.82	73.96	74.52	6.38
>100g	103.46–152.20	121.01	125.99	13.92	100.71–166.83	121.06	122.88	12.98