Measured parameters and minimum and maximum incidence estimates across different observation strategies
| Parameter | BCAHA official injury reports | Direct observation | Retrospective survey | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male (PW, B, M) | Female (all levels) | Volunteer reports | Elite (male) | Elite (female) | Non-elite | |||||||
| PW, Pee wee; B, Bantam; M, Midget; CX, concussion; IOC, incident of concern. *Per 1000 PGH. | ||||||||||||
| Time period | 1 season | 1 season | 3.5 months | 2 seasons | 2 seasons | 2 Seasons | ||||||
| No. of players at risk | 19548 | 5017 | 792 | 475 | 309 | 107 | ||||||
| No. of CX or IOC* | 60 | 7 | 22 | 79 | 69 | 26 | ||||||
| AE | ||||||||||||
| Minimum no. | 20 | 20 | 14 | 80 | 80 | 40 | ||||||
| Maximum no. | 50 | 50 | 25 | 100 | 100 | 100 | ||||||
| Minimum incidence* | 0.06 | 0.03 | 1.11 | 1.66 | 2.23 | 2.43 | ||||||
| Maximum incidence* | 0.15 | 0.07 | 1.98 | 2.08 | 2.79 | 6.07 | ||||||
| PGH | ||||||||||||
| Minimum no. | 97 740 | 25 085 | 2772 | 9500 | 6180 | 1070 | ||||||
| Maximum no. | 244 350 | 62 713 | 4950 | 11 875 | 7725 | 2675 | ||||||
| Minimum incidence* | 0.25 | 0.09 | 4.44 | 6.65 | 8.93 | 9.72 | ||||||
| Maximum incidence* | 0.61 | 0.28 | 7.94 | 8.32 | 11.17 | 24.30 | ||||||