Table 2.
Injury Incidence (IRa) and Injury Incidence Rate Ratio (IRR) for the Neck Training and Comparison Groups
|
Group |
Players, No. |
Exposure Hours |
Pain on Heading a Ball, No. (%, IR) |
IRR |
Potential Concussive Event, No. (%, IR) |
IRR |
Concussion, No. (%, IR) |
IRR |
Other Head or Neck Injury, No. (%, IR) |
IRR |
| Neck training | 146 | 18 011 | 19 (13, 1.05) | 0.62b (0.34–1.07) | 7 (5, 0.38) | 0.38c (0.14–0.90) | 2 (1, 0.11) | 0.23b (0.03–1.04) | 4 (3, 0.22) | 1.01 (0.21–4.29) |
| Comparison | 218 | 27 485 | 47 (22, 1.71) | 28 (12, 0.94) | 13 (6, 0.47) | 6 (3, 0.22) |
a
Per 1000 player-hours.
b
Uncertain evidence of a worthwhile effect.
c
Certain evidence of a worthwhile effect (P ≤ .05).