Table 4.
Demographic and Injury History Characteristics Between Contact or Collision Sport Athletes and No- or Limited-Contact Sport Athletes with No History of Concussiona
| Variable |
Sport Group |
P Value |
Effect Size (95% Confidence Interval) |
|
| Contact or Collision (n = 55) |
No or Limited Contact (n = 38) |
|||
| Male athletes | 55 (100) | 38 (100) | ||
| Age, yb | 14.9 (14.2, 16.0) | 14.9 (14.5, 16.1) | .88 | 0.13 (−0.28, 0.55) |
| Age group | 13–15 y: 28 (51) | 13–15 y: 20 (53) | .87 | |
| 16–18 y: 27 (49) | 16–18 y: 18 (47) | |||
| Height, cm | 174.2 ± 18.0 | 174.2 ± 7.4 | .99 | 0.00 (−0.41, 0.42) |
| Weight, kg | 71.1 ± 17.5 | 65.8 ± 19.1 | .17 | 0.29 (−0.13, 0.71) |
| Average time training, h/wk | 13.2 ± 5.5 | 10.9 ± 4.4 | .06 | 0.46 (−0.03, 0.95) |
| Varsity athlete | 19 (35) | 8 (21) | .16 | |
| History of bone, muscle, ligament, or tendon injury | 25 (45) | 5 (13) | .001 | |
| History of acute fracture or dislocation | 24 (44) | 9 (24) | .05 | |
| History of stress fracture | 5 (9) | 2 (5) | .48 | |
| Organized sports played in the past year | Football: 45 (82) Football and lacrosse: 6 (11) Lacrosse: 4 (7) |
Baseball: 2 (5) Cross-country: 8 (21) Golf: 5 (13) Marching band: 2 (5) Swimming: 4 (11) Tennis: 7 (18) Track & field: 10 (26) |
||
| Lifetime years playing collision/contact sports | 7.3 ± 3.0 | 4.1 ± 3.0 | .001 | 1.09 (0.43, 1.74) |
a
Continuous variables are presented as mean ± SD; categorical variables are presented as the number included in each group (%).
b
Data presented as median (interquartile range).