ACL-R incidence rate per 1000 athlete exposures with incidence rate ratio per divisions by sex (99% CI)
| Football | Handball | Basketball | Ice hockey | Floorball | Alpine sports | Total | ||
| ACL-R incidence rate and incidence rate ratio per division per 1000 athlete exposure in females | ||||||||
| Unadjusted IR | Second highest division/freestyle skiing | 1.41 | 1.89 | 1.40 | – | 0.95 | 2.30 | 1.26 |
| (99% CI) | (1.11 to 1.80) | (1.32 to 2.70) | (1.01 to 1.93) | (0.74 to 1.21) | (0.80 to 6.58) | (1.09 to 1.46)* | ||
| Highest division/alpine skiing (ref) | 1.21 | 1.17 | 0.96 | 0.08 | 0.79 | 0.88 | 0.79 | |
| (0.88 to 1.67) | (0.79 to 1.74) | (0.58 to 1.61) | (0.03 to 0.25) | (0.57 to 1.11) | (0.62 to 1.25) | (0.65 to 0.96)* | ||
| Unadjusted IRR | 1.16 | 1.61 | 1.45 | – | 1.19 | 2.62 | 1.59 | |
| (99% CI) | (0.78 to 1.74) | (0.94 to 2.75) | (0.79 to 2.66) | (0.79 to 1.81) | (0.86 to 7.93) | (1.25 to 2.03)* | ||
| P value | 0.328 | 0.022 | 0.117 | 0.275 | 0.025 | <0.001 | ||
| Adjusted IR | Second highest division/freestyle skiing | 1.36 | 1.84 | 1.41 | – | 0.9 | 2.13 | 1.27 |
| (99% CI) | (1.03 to 1.79) | (1.27 to 2.65) | (1.00 to 1.99) | (0.70 to 1.17) | (0.72 to 6.30) | (1.10 to 1.47)* | ||
| Highest division/alpine skiing (ref) | 1.28 | 1.17 | 0.95 | 0.08 | 0.87 | 1.04 | 0.76 | |
| (0.89 to 1.85) | (0.79 to 1.74) | (0.54 to 1.69) | (0.03 to 0.26) | (0.60 to 1.25) | (0.64 to 1.69) | (0.63 to 0.93)* | ||
| Adjusted IRR | 1.06 | 1.57 | 1.48 | – | 1.04 | 2.05 | 1.67 | |
| (99% CI) | (0.64 to 1.76) | (0.92 to 2.68) | (0.73 to 3.02) | (0.65 to 1.68) | (0.58 to 7.27) | (1.30 to 2.15)* | ||
| P value | 0.772 | 0.031 | 0.157 | 0.820 | 0.145 | <0.001 | ||
| ACL-R incidence rate and incidence rate ratio per division per 1000 athlete exposure in males | ||||||||
| Unadjusted IR | Second highest division/freestyle skiing | 0.64 | 0.70 | 0.14 | 0.06 | 0.32 | 1.10 | 0.32 |
| (99% CI) | (0.47 to 0.89) | (0.40 to 1.22) | (0.05 to 0.39) | (0.03 to 0.15) | (0.20 to 0.50) | (0.36 to 3.39) | (0.26 to 0.40)* | |
| Highest division/alpine skiing (ref) | 0.53 | 0.46 | 0.33 | 0.11 | 0.27 | 0.30 | 0.31 | |
| (0.37 to 0.75) | (0.26 to 0.80) | (0.15 to 0.69) | (0.05 to 0.21) | (0.16 to 0.46) | (0.14 to 0.67) | (0.24 to 0.38)* | ||
| Unadjusted IRR | 1.22 | 1.53 | 0.42 | 0.59 | 1.17 | 3.65 | 1.04 | |
| (99% CI) | (0.76 to 1.96) | (0.70 to 3.35) | (0.11 to 1.53) | (0.20 to 1.73) | (0.58 to 2.34) | (0.92 to 14.48) | (0.76 to 1.42)* | |
| P value | 0.291 | 0.164 | 0.083 | 0.209 | 0.566 | 0.016 | 0.727 | |
| Adjusted IR | Second highest division/freestyle skiing | 0.62 | 0.71 | 0.14 | 0.06 | 0.32 | 1.07 | 0.35 |
| (99% CI) | (0.44 to 0.87) | (0.41 to 1.23) | (0.05 to 0.41) | (0.03 to 0.15) | (0.20 to 0.51) | (0.40 to 2.85) | (0.27 to 0.44)* | |
| Highest division/alpine skiing (ref) | 0.55 | 0.46 | 0.28 | 0.11 | 0.26 | 0.29 | 0.30 | |
| (0.38 to 0.78) | (0.26 to 0.80) | (0.11 to 0.74) | (0.05 to 0.24) | (0.15 to 0.45) | (0.14 to 0.59) | (0.23 to 0.40)* | ||
| Adjusted IRR | 1.13 | 1.54 | 0.51 | 0.57 | 1.24 | 3.63 | 1.15 | |
| (99% CI) | (0.68 to 1.88) | (0.70 to 3.42) | (0.12 to 2.20) | (0.16 to 2.06) | (0.59 to 2.61) | (1.12 to 11.77) | (0.79 to 1.67)* | |
| P value | 0.532 | 0.160 | 0.232 | 0.261 | 0.458 | 0.005 | 0.350 | |
Statistical method: Negative binomial regression using maximum likelihood estimation, with log link function.
Covariates in adjusted regression model: age.
*Not including alpine sports.
ACL-R, anterior cruciate ligament reconstruction; IR, incidence rate; IRR, incidence rate ratio.