Table 1. .
Participant Demographics
| Characteristic |
Mean ± SD |
||
| Males (n = 198) |
Females (n = 90) |
Total (n = 288) |
|
| Age, y | 15.6 ± 1.3 | 15.6 ± 1.1 | 15.6 ± 1.2 |
| Frequency, No. (%)a |
|||
| Grade | |||
| 8 | 1 (0.01) | — | 1 (<0.01) |
| 9 | 70 (35.4) | 28 (31.1) | 98 (34.0) |
| 10 | 39 (19.7) | 22 (24.4) | 61 (21.2) |
| 11 | 48 (24.2) | 24 (27.8) | 72 (25.0) |
| 12 | 39 (19.7) | 15 (16.7) | 54 (18.8) |
| Not reported | 1 (0.01) | 1 (1.1) | 2 (0.01) |
| Race | |||
| African American | 99 (50.0) | 36 (40.0) | 135 (46.9) |
| White | 22 (11.1) | 16 (17.8) | 38 (13.2) |
| Hispanic | 20 (10.1) | 8 (8.9) | 28 (9.7) |
| Asian | 7 (3.5) | 8 (8.9) | 15 (5.2) |
| American Indian | — | 2 (2.2) | 2 (0.01) |
| Mixed | 15 (7.6) | 7 (7.8) | 22 (7.6) |
| Other | 26 (13.1) | 12 (13.3) | 38 (13.2) |
| Not reported | 9 (4.5) | 1 (1.1) | 10 (3.5) |
| Sport | |||
| Football | 82 (41.4) | 2 (2.2) | 84 (29.2) |
| Wrestling | 31 (15.7) | — | 31 (10.8) |
| Volleyball | 1 (0.01) | 43 (47.8) | 44 (15.3) |
| Basketball | 46 (23.2) | 30 (33.3) | 76 (26.4) |
| Soccer | 28 (14.1) | 12 (13.3) | 40 (13.9) |
| Other | — | 1 (1.1) | 1 (<0.01) |
| Not reported | 10 (5.1) | 2 (2.2) | 12 (4.2) |
| Concussion history | |||
| 0 | 151 (76.3) | 79 (87.8) | 230 (79.9) |
| 1 | 27 (13.6) | 6 (6.7) | 33 (11.5) |
| 2+ | 20 (10.1) | 5 (5.6) | 25 (8.7) |
a
Percentage of group. Dash indicates no data available.