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Distribution of Concussion History at Baseline Stratified by Sample Characteristics (Total Sample, N = 4792)
| Characteristics | Total | No concussion | 1 Concussion | 2 Concussion | 3+ Concussions |
|---|---|---|---|---|---|
| Boys (n, %) | 2557 (51.4) | 2082 (81.4) | 326 (14.6) | 99 (4.4) | 23 (0.9) |
| Girls (n, %) | 2235 (48.6) | 1966 (87.9) | 191 (8.5) | 55 (2.5) | 50 (2.2) |
| ADHD (n, %) | 255 (5.3) | 198 (77.7) | 31 (12.2) | 11 (4.3) | 15 (5.9) |
ADHD, attention-deficit hyperactivity disorder.
