TABLE 1.
Summary of Demographic Information for Participants by Age Group and Competition Level (n = 397)
| Age | Total, n = 397 | ||
|---|---|---|---|
| 12–14, n = 159 | 15–18, n = 238 | ||
| Age, y, mean (SD) | 12.79 (1.12) | 16.25 (1.03)* | 14.73 (1.99) |
| Girls, n (%) | 24 (15.1) | 43 (18.1) | 67 (16.9) |
| Height, cm, mean (SD) | 158.59 (10.13) | 174.46 (11.06)* | 167.40 (12.52) |
| Weight, kg, mean (SD) | 50.10 (11.82) | 69.59 (11.99)* | 61.00 (15.60) |
| No. previous concussions, mean (SD) | 0.27 (0.57) | 0.48 (0.93)* | 0.39 (0.79) |
| Learning disorder, n (%) | 2 (1.3) | 9 (3.8) | 11 (2.8) |
| ADD/ADHD, n (%) | 6 (3.8) | 12 (5.0) | 18 (4.5) |
| Migraine/headache, n (%) | 18 (11.3) | 33 (13.9) | 51 (12.8) |
| Games, n (%) | 2785 (49.4)** | 7800 (44.0) | 10 585 (45.3) |
| Checking not allowed, n (%) | 37 (23.3) | 67 (28.2) | 104 (26.2) |
| Western Pennsylvania site, n (%) | 142 (89.3) | 218 (84.2) | 104 (26.2) |
| Boston, Massachusetts, site, n (%) | 10 (6.3) | 21 (8.8) | 31 (7.8) |
| Birmingham, Alabama, site, n (%) | 7 (4.4) | 20 (8.4) | 104 (26.2) |
*
P < .05; **P < .01.