Table 1.
Baseline characteristics for under-13, under-15 and under-18 youth ice hockey players over five seasons (2013–2018).
| Under-13 |
Under-15 |
Under-18 |
||||
|---|---|---|---|---|---|---|
| Injured (nc = 159) | No injury (nc = 1410) | Injured (nc = 591) | No injury (nc = 2486) | Injured (nc = 439) | No injury (nc = 1499) | |
| City, n (%) | ||||||
| Calgary | 150 (94.34) | 1292 (91.63) | 392 (66.33) | 1549 (62.31) | 276 (62.87) | 832 (55.50) |
| Calgary surrounding area | 1 (0.63) | 29 (2.06) | 13 (2.20) | 57 (2.29) | 24 (5.47) | 45 (3.00) |
| Edmonton | 8 (5.03) | 88 (6.24) | 142 (24.03) | 520 (20.92) | 105 (23.92) | 291 (19.41) |
| Vancouver | 0 (0) | 0 (0) | 42 (7.11) | 321 (12.91) | 34 (7.74) | 331 (22.08) |
| Okanagan region | 0 (0) | 1 (0.07) | 2 (0.34) | 39 (1.57) | 0 (0) | 0 (0) |
| Year, n (%) | ||||||
| 2013–2014 | 80 (50.31) | 652 (46.24) | 19 (3.21) | 71 (2.86) | 0 (0) | 0 (0) |
| 2014–2015 | 48 (30.19) | 340 (24.11) | 180 (30.46) | 830 (33.39) | 0 (0) | 0 (0) |
| 2015–2016 | 11 (6.92) | 83 (5.89) | 198 (33.50) | 702 (28.24) | 199 (45.33) | 709 (47.30) |
| 2016–2017 | 13 (8.18) | 172 (12.20) | 101 (17.09) | 490 (19.71) | 133 (30.30) | 410 (27.35) |
| 2017–2018 | 7 (4.40) | 163 (11.56) | 93 (15.74) | 393 (15.81) | 107 (24.37) | 380 (25.35) |
| Sex, n (%) | ||||||
| Male | 141 (88.68) | 1295 (91.84) | 519 (87.82) | 2252 (90.59) | 388 (88.38) | 1390 (92.73) |
| Female | 18 (11.32) | 115 (8.16) | 72 (12.18) | 234 (9.41) | 51 (11.62) | 109 (7.27) |
| Sex within league, n (%) | ||||||
| Males in mainly male leagues | 141 (88.68) | 1295 (91.84) | 519 (87.82) | 2252 (90.59) | 388 (88.38) | 1390 (92.73) |
| Females in ‘female-only’ | 10 (6.29) | 38 (2.70) | 62 (10.49) | 183 (7.36) | 47 (10.71) | 91 (6.07) |
| Females in mainly male-based leagues | 8 (5.03) | 77 (5.46) | 10 (1.69) | 51 (2.05) | 4 (0.91) | 18 (1.20) |
| Anthropometrics | ||||||
| Height, cm, median (Q1, Q3) | 152.4 (147.0, 158.3) | 152.2 (147.0, 157.5) | 165.1 (157.6, 172.0) | 165.3 (159.0, 172.5) | 177.8 (171.2, 180.3) | 177.0 (171.40, 182.9) |
| Missing, n (%) | 20 (12.58) | 74 (5.25) | 187 (31.64) | 875 (35.20) | 116 (26.42) | 512 (34.16) |
| Weight, kg, median (Q1, Q3) | 42.4 (35.6, 48.8) | 41.4 (36.5, 47.0) | 54.4 (46.5, 62.5) | 54.0 (46.7, 61.2) | 68.0 (61.2, 74.8) | 68.0 (61.2, 76.0) |
| Missing, n (%) | 21 (13.21) | 55 (3.90) | 192 (32.49) | 838 (33.71) | 118 (26.88) | 499 (33.29) |
| Level of play, n (%) | ||||||
| Elite (top 20–30%) | 52 (32.70) | 470 (33.33) | 193 (32.66) | 551 (22.16) | 165 (37.59) | 425 (28.35) |
| Sub-elite (lower 70–80%) | 95 (59.75) | 848 (60.14) | 376 (63.62) | 1806 (72.65) | 262 (59.68) | 1022 (68.18) |
| Missing | 12 (7.55) | 92 (6.52) | 22 (3.72) | 129 (5.19) | 12 (2.73) | 52 (3.47) |
| Bodychecking policy, n (%) | ||||||
| Allowed | NA | NA | 443 (74.96) | 1512 (60.82) | 332 (75.63) | 897 (59.84) |
| Prohibited | 159 (100) | 1410 (100) | 132 (22.34) | 853 (34.31) | 99 (22.55) | 561 (37.42) |
| Missing | 0 (0) | 0 (0) | 16 (2.71) | 121 (4.87) | 8 (1.82) | 41 (2.74) |
| Year of play, n (%) | ||||||
| First | 69 (43.40) | 649 (46.03) | 277 (46.87) | 1196 (48.11) | 172 (39.18) | 618 (41.23) |
| Second | 90 (56.60) | 755 (53.55) | 289 (48.90) | 1176 (47.30) | 128 (29.16) | 520 (34.69) |
| Third | NA | NA | NA | NA | 69 (15.72) | 208 (13.88) |
| Missing | 0 (0) | 6 (0.43) | 25 (4.23) | 114 (4.59) | 70 (15.95) | 153 (10.21) |
| Position, n (%) | ||||||
| Forward | 82 (51.57) | 740 (52.48) | 319 (53.98) | 1242 (49.96) | 226 (51.48) | 713 (47.57) |
| Defence | 57 (35.85) | 441 (31.28) | 186 (31.47) | 726 (29.20) | 128 (29.16) | 407 (27.15) |
| Goalie | 9 (5.66) | 133 (9.43) | 29 (4.91) | 216 (8.69) | 27 (6.15) | 153 (10.21) |
| Missing | 11 (6.92) | 96 (6.81) | 57 (9.64) | 302 (12.15) | 58 (13.21) | 226 (15.08) |
| Previous injurya | ||||||
| No | 69 (43.40) | 884 (62.70) | 229 (38.75) | 1236 (49.72) | 141 (32.12) | 707 (47.16) |
| Yes | 60 (37.74) | 329 (23.33) | 238 (40.27) | 752 (30.25) | 219 (49.89) | 547 (36.49) |
| Missing | 30 (18.87) | 197 (13.97) | 124 (20.98) | 498 (20.03) | 79 (18.00) | 245 (16.34) |
| Previous concussionb | ||||||
| No | 91 (57.23) | 975 (69.15) | 287 (48.56) | 1509 (60.70) | 154 (35.08) | 735 (49.03) |
| Yes | 65 (40.88) | 415 (29.43) | 270 (45.69) | 875 (35.20) | 255 (58.09) | 678 (45.23) |
| Missing | 3 (1.89) | 20 (1.42) | 34 (5.75) | 102 (4.10) | 30 (6.83) | 86 (5.74) |
Q1: first quartile; Q3: third quartile.
a
Previous injury or concussion 12 months prior to baseline test.
b
Previous concussion lifetime.
c
Sum of n is 6584, given that it is player-seasons (1344 players participated in more than one season).