Table 3.
ACL Tears by 1000 AEs a
| ACL Tears per 1000 AEs | IRR, Preseason vs In-Season (95% CI) | ||||
|---|---|---|---|---|---|
| Year | Total | Preseason | In-Season | P-value | |
| 2013 | 0.100 | 0.173 | 0.071 | 2.44 (1.44-4.14) | .0005 |
| 2014 | 0.070 | 0.123 | 0.049 | 2.52 (1.33-4.78) | .0027 |
| 2015 | 0.076 | 0.139 | 0.051 | 2.74 (1.49-5.06) | .0006 |
| 2016 | 0.071 | 0.125 | 0.051 | 2.45 (1.30-4.60) | .0033 |
| 2017 | 0.081 | 0.175 | 0.044 | 3.97 (2.19-7.36) | <.00001 |
| 2018 | 0.084 | 0.162 | 0.053 | 3.05 (1.71-5.47) | .0001 |
| 2019 | 0.052 | 0.072 | 0.044 | 1.64 (0.75-3.46) | .17 |
| 2020 | 0.092 | - b | 0.072 | - | - |
a Boldface P values denote statistically significant difference between preseason and in-season incidence rate of tears (P < .05). ACL, anterior cruciate ligament; AE, athlete-exposure; CI, confidence interval; IRR: incidence rate ratio per 1000 AEs.
b There were no preseason games played in 2020.