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Demographic characteristics of sample
| Demographic | Frequency (number of schools) | Per cent |
| Size (number of students) | ||
| Up to 250 (very small) | 7 | 5% |
| 251–500 (small) | 24 | 16% |
| 501–750 (medium) | 40 | 27% |
| 751–1000 (large) | 26 | 17% |
| 1,000+ (very large) * | 52 | 35% |
| Locale | ||
| Urban (city) | 13 | 9% |
| Suburban* | 99 | 67% |
| Rural | 35 | 23% |
| Athletic trainer | ||
| Yes | 114 | 77% |
| No* | 35 | 23% |
| Concussion management team | ||
| Yes | 133 | 89% |
| No* | 16 | 11% |
| Average per cent of non-white students | 22% | |
| Mean EDR score | 19.38 | |
*Reference category.
