| Artificial floors | Wooden floors | IRR* | p Value | |||
| n | Incidence | n | Incidence | |||
| All traumatic injuries | 36 | 59.9 (43.2 to 83.0) | 26 | 26.8 (18.2 to 39.3) | 2.1 (1.2 to 3.5) | 0.005 |
| Injury location | ||||||
| Lower limb | 27 | 44.9 (30.8 to 65.5) | 21 | 21.6 (14.1 to 33.1) | 2.0 (1.1 to 3.5) | 0.022 |
| Ankle | 8 | 13.3 (6.7 to 26.6) | 6 | 6.2 (2.7 to 13.7) | 2.3 (0.8 to 6.6) | 0.138 |
| Knee | 8 | 13.3 (6.7 to 26.6) | 7 | 7.2 (3.4 to 15.1) | 1.8 (0.6 to 5.1) | 0.264 |
| Spine and trunk | 3 | 5.0 (1.6 to 15.4) | 4 | 4.1 (1.5 to 10.9) | 1.1 (0.2 to 5.0) | 0.919 |
| Head and neck | 4 | 6.7 (2.5 to 7.7) | 1 | 1.0 (0.1 to 7.3) | 5.7 (0.6 to 53.6) | 0.126 |
| Upper limb | 2 | 3.3 (0.8 to 13.3) | 0 | – | – | – |
| Injury type | ||||||
| Sprain | 17 | 28.3 (17.6 to 45.5) | 13 | 13.4 (7.8 to 23.0) | 2.0 (0.9 to 4.1) | 0.065 |
| Strain | 7 | 11.6 (5.5 to 24.4) | 3 | 3.1 (1.0 to 9.6) | 3.7 (0.9 to 14.6) | 0.062 |
| Contusion | 8 | 13.3 (6.7 to 26.6) | 8 | 8.2 (4.1 to 16.4) | 1.4 (0.5 to 3.8) | 0.526 |
| Fracture | 0 | – | 2 | 2.1 (0.5 to 8.2) | – | – |
| Concussion | 2 | 3.3 (0.8 to 13.3) | 0 | – | – | – |
| Nerve lesion | 1 | 1.7 (0.2 to 11.8) | 0 | – | – | – |
| Laceration | 1 | 1.7 (0.2 to 11.8) | 0 | – | – | – |
| Injury situation | ||||||
| Contact | 19 | 31.6 (20.2 to 49.6) | 24 | 24.7 (16.6 to 36.9) | 1.2 (0.6 to 2.2) | 0.578 |
| Non-contact | 17 | 28.3 (17.6 to 45.4) | 2 | 2.1 (0.5 to 8.2) | 12.5 (2.9 to 54.9) | 0.001 |
| Injury severity† | ||||||
| Minor | 16 | 26.6 (16.3 to 43.4) | 17 | 17.5 (10.9 to 28.2) | 1.4 (0.7 to 2.9) | 0.315 |
| Moderate | 11 | 18.3 (10.1 to 33.1) | 5 | 5.1 (2.1 to 12.3) | 3.3 (1.1 to 9.7) | 0.029 |
| Major | 9 | 15.0 (7.8 to 28.8) | 4 | 4.1 (1.5 to 11.0) | 3.3 (0.9 to 10.9) | 0.052 |
Injury incidence and adjusted IRRs are given with 95% CIs. IRR is obtained from Poisson model (p value from the z test). Significance level was <0.05.
*IRR for artificial floors versus wooden floors. The IRR was adjusted for age, body mass index, training volume, floorball experience and previous injuries.
†Injury severity: minor = time-loss 1–7 days, moderate = 8–28 days, major = more than 28 days.