Table 2

Baseline characteristics comparing Midget (15–17 years) ice hockey players in Calgary, Edmonton and Vancouver over three seasons (2015–2016, 2016–2017 and 2017–2018)

CharacteristicBody checking permitted
n=52 teams (n=674 plyers)
Body checking prohibited
n=44 team (n=453 players)
Injured (n*=179)Not injured (n*=495)Injured (n*=39)Not injured (n*=414)
City, No (%)
 Calgary126 (70.39)374 (75.56)11 (28.21)30 (7.25)
 Edmonton53 (29.61)121 (24.44)0 (0)47 (11.35)
 Vancouver0 (0)0 (0)28 (71.79)337 (81.40)
Year, No (%)
 2015–201686 (48.04)235 (47.47)28 (71.79)337 (81.40)
 2016–201743 (24.02)117 (23.64)6 (15.38)66 (15.94)
 2017–201850 (27.93)143 (28.89)5 (12.82)11 (2.66)
Sex, No (%)
 Male179 (100)490 (98.99)39 (100)410 (99.03)
 Female0 (0)4 (0.81)0 (0)4 (0.97)
 Preferred not to answer0 (0)1 (0.20)0 (0)0 (0)
Anthropometrics
 Height, cm, median (Q1, Q3)177.8 (172.7, 180.3)177.8 (172.7, 182.9)178.9 (173.3, 180.3)177.8 (170.2, 182.9)
 Missing data, No (%)49 (27.37)109 (22.02)9 (23.08)63 (15.22)
 Weight, kg, median (Q1, Q3)67.3 (60.2, 74.2)68.0 (61.3, 77.1)63.5 (58.3, 77.1)65.8 (59.0, 74.6)
 Missing data, No (%)47 (26.26)107 (21.62)12 (30.77)84 (20.29)
Year of play, No (%)
 First51 (28.49)151 (30.51)15 (38.46)167 (40.34)
 Second61 (34.08)151 (30.51)18 (46.15)209 (50.48)
 Third26 (14.53)103 (20.81)2 (5.13)7 (1.69)
 Missing data41 (22.91)90 (18.18)4 (10.26)31 (7.49)
Position, No (%)
 Forward90 (50.28)226 (45.66)22 (56.41)209 (50.48)
 Defence56 (31.28)121 (24.44)9 (23.08)109 (26.33)
 Goalie7 (3.91)54 (10.91)3 (7.69)39 (9.42)
 Missing data26 (14.53)94 (18.99)5 (12.82)57 (13.77)
Previous injury†, No (%)
 No59 (32.96)231 (46.67)20 (51.28)298 (71.98)
 Yes75 (41.90)144 (29.09)11 (28.21)77 (18.60)
 Missing data45 (25.14)120 (24.24)8 (20.51)39 (9.42)
Previous concussion‡, No (%)
 No62 (34.64)238 (48.08)12 (30.77)245 (59.18)
 Yes102 (56.98)212 (42.83)24 (61.54)155 (37.44)
 Missing data15 (8.38)45 (9.09)3 (7.69)14 (3.38)
  • *Sum of n is 1127, given that it is player-season (120 players participated in more than one season).

  • †Previous injury history 12 months prior to baseline test.

  • ‡Previous concussion (lifetime).