Participant demographics
| Characteristics | NoHG (n=1545) | HG (n=1505) |
| Age, years* | 15.7 (1.2) | 15.6 (1.2) |
| Sex† | ||
| Female | 999 (64.7) | 1031 (68.5) |
| Male | 546 (35.3) | 474 (31.5) |
| Grade† | ||
| 9th | 443 (28.7) | 487 (32.4) |
| 10th | 424 (27.4) | 421 (28.0) |
| 11th | 398 (25.8) | 358 (23.8) |
| 12th | 280 (18.1) | 238 (15.8) |
| Previous SRC (within 12 months), yes† | 124 (8.0) | 147 (9.8) |
| Previous SRC (ever), yes† | 266 (17.2) | 295 (19.6) |
| Total SCAT3 symptom score‡ | 0.0 (0.0–2.0) | 0.0 (0.0–3.0) |
| Total SCAT3 symptom score groups† | ||
| 0 | 929 (60.1) | 879 (58.4) |
| 1–5 | 428 (27.7) | 415 (27.6) |
| >5 | 188 (12.2) | 211 (14.0) |
| SCAT3 symptom severity score‡ | 0.0 (0.0–3.0) | 0.0 (0.0–4.0) |
| SCAT3 symptom severity score groups† | ||
| 0 | 929 (60.1) | 879 (58.4) |
| 1–7 | 445 (28.8) | 407 (27.0) |
| >7 | 171 (11.1) | 219 (14.6) |
*Reported as mean (SD).
†Sex, grade, previous SRC, SCAT3 symptom and severity reported as frequency and (%).
‡Total SCAT3 symptom and severity scores reported as median (IQR: 25th–75th).
HG, headgear group; NoHG, no headgear group; SRC, sport-related concussion.