Table 1.
Descriptive Characteristics of Sport-Related Concussion Cases Occurring in Michigan High School Athletic Association Football During the 2015–2016 Through 2019–2020 Athletic Seasons
| Characteristic |
No. (%) |
| Grade | |
| 9 | 2417 (31.2) |
| 10 | 2165 (27.9) |
| 11 | 1584 (20.4) |
| 12 | 1589 (20.5) |
| Level | |
| Varsity | 3583 (46.2) |
| Junior varsity | 2862 (36.9) |
| Freshman | 1310 (16.9) |
| Previous concussion history? | |
| Yes | 2897 (37.4) |
| No | 4858 (62.6) |
| Season | |
| 2015–2016 | 1905 (24.6) |
| 2016–2017 | 1627 (21.0) |
| 2017–2018 | 1423 (18.3) |
| 2018–2019 | 1437 (18.5) |
| 2019–2020 | 1363 (17.6) |
| Initial evaluation | |
| Athletic trainer | 6181 (79.7) |
| No athletic trainer | 1574 (20.3) |