Table 1:

Baseline characteristics of 1971 hockey players in Bantam leagues (ages 13–14 years) with and without previous bodychecking experience in Pee Wee leagues (ages 11–12 years), 2008/09

Characteristic	Injured		Not injured
	Previous bodychecking experience*n = 223	No previous bodychecking experience*n = 203	Previous bodychecking experience*n = 772	No previous bodychecking experience*n = 773
Sex, no. (%)
Male	222 (99.6)	200 (98.5)	768 (99.5)	766 (99.1)
Female	1 (0.4)	3 (1.5)	4 (0.5)	7 (0.9)
Height, cm, mean (SD)	n = 217 168.2 (9.5)	n = 202 168.3 (8.4)	n = 753 167.5 (9.4)	n = 767 168.1 (8.3)
Weight, kg, mean (SD)	n = 219 58.6 (10.8)	n = 202 59.4 (9.8)	n = 750 57.3 (10.5)	n = 768 60.0 (10.1)
Year of play in Bantam league, no. (%)	n = 223	n = 203	n = 772	n = 773
First year	95 (42.6)	75 (36.9)	325 (42.1)	247 (32.0)
Second year	126 (56.5)	126 (62.1)	432 (56.0)	516 (66.8)
Data missing	2 (0.9)	2 (1.0)	15 (1.9)	10 (1.3)
Level of play
Top 30%	117 (52.5)	75 (36.9)	262 (33.9)	233 (30.1)
Lower 70%	106 (47.5)	128 (63.1)	510 (66.1)	540 (69.9)
Position of player
Forward	130 (58.3)	119 (58.6)	426 (55.2)	407 (52.7)
Defence	75 (33.6)	70 (34.5)	238 (30.8)	259 (33.5)
Goalie	15 (6.7)	13 (6.4)	95 (12.3)	101 (13.1)
Data missing	3 (1.3)	1 (0.5)	13 (1.7)	6 (0.8)
Previous injury (past year)
Yes	98 (43.9)	73 (36.0)	243 (31.5)	222 (28.7)
No	123 (55.2)	128 (63.1)	520 (67.4)	544 (70.4)
Data missing	2 (0.9)	2 (1.0)	9 (1.2)	7 (0.9)
Previous concussion (ever)
Yes	75 (33.6)	47 (23.2)	214 (27.7)	117 (15.1)
No	143 (64.1)	155 (76.4)	539 (69.8)	643 (83.2)
Data missing	5 (2.2)	1 (0.5)	19 (2.5)	13 (1.7)
Attitude toward bodychecking, mean score (SD)†	n = 215 38.6 (6.0)	n = 191 36.9 (6.9)	n = 721 37.7 (6.2)	n = 724 36.4 (7.0)

Note: SD = standard deviation.

^*In Pee Wee leagues.

^†Total score possible = 55; a higher score indicates a more positive attitude toward bodychecking.