Table 3

Multivariate risk factor analyses for game-related injury, injury resulting in >1 week time loss, concussion and concussion resulting in > 10 days time loss in Pee Wee (2007–2008 season) and Bantam (2008–2009 season)

			Game injury	Game concussion	Game injury >7 days time loss	Game concussion >10 days time loss
Win–loss record		>50% wins	0.78 (0.64–0.95^*)	0.75 (0.52–1.08)	0.64 (0.47–0.88)^*	0.74 (0.39–1.40)
		≤50%	1	1	1	1
Penalty minutes per game		>median	0.99 (0.80–1.22)	1.10 (0.75–1.61)	0.79 (0.58–1.07)	0.80 (0.40–1.59)
Penalty minutes per game		≤median	1	1	1	1
Level of play^‡		Upper	1.14 (0.93–1.39)	0.97 (0.66–1.43)	1.31 (0.99–1.73)	0.84 (0.43–1.65)
Level of play^‡		Lower	1	1	1	1
Low weight		Lower	1.11 (0.91–1.36)	1.22 (0.85–1.75)	0.95 (0.69–1.31)	0.57 (0.26–1.24)
Low weight		Normal	1	1	1	1
Year of play		1st	1.24 (1.04–1.48)^*	1.31 (0.91–1.87)	1.27 (0.97–1.67)	1.75 (0.80–3.83)
Year of play		2nd	1	1	1	1
Age	Pee Wee	Alberta	3.04 (2.17–4.25)^†	3.68 (1.92–7.07)^†	3.60 (1.84–7.02)^†	4.48 (1.25–16.06)^*
	Pee Wee	Quebec	1	1	1	1
	Bantam	Alberta	2.65 (1.38–5.08)^*	1.81 (0.55–6.04)	4.66 (1.42–15.29)^*	2.55 (0.28–22.99)
	Bantam	Quebec	3.24 (2.30–4.57)^†	2.52 (1.29–4.90)^*	6.77 (3.60–12.74)^†	4.82 (1.57–14.77)^*
Previous injury		Yes	1.60 (1.32–1.94)^†	NA	2.22 (1.75–2.83)^†	NA
Previous injury		No	1	NA	1	NA
Previous concussion		Yes	NA	2.04 (1.46–2.86)^†	NA	2.55 (1.33–4.88)^*
Previous concussion		No	NA	1	NA	1
Position		Forward	1	1	1	1
		Defense	0.88 (0.74–1.06)	0.95 (0.68–1.33)	0.90 (0.68–1.17)	0.51 (0.26–1.00)
		Goalie	0.39 (0.28–0.54)^†	0.37 (0.17–0.80)^†	0.29 (0.15–0.58)^†	0.19 (0.03–1.43)

↵* p <0.05
↵† p <0.001
↵‡ Level of play was defined within age group. In Pee Wee, the cohort included only the upper 60% of divisions of play overall; thus the study's upper level refers to top 20% and lower level referred to mid-40%. In Bantam, the cohort included only the upper 30% of divisions of play overall; thus the study's upper level includes the top 10% and lower level includes the next 20%.