Table 3.
Intention to treat analysis. Values are numbers (percentages) of injured players
| Intervention group (n=958) | Control group (n=879) | Intracluster correlation coefficient | Inflation factor | Number needed to treat | Relative risk (95% CI)* | P value (Wald's test) | |
|---|---|---|---|---|---|---|---|
| All injuries | 95 (9.9) | 167 (19.0) | 0.043 | 1.6 | 11 | 0.49 (0.36 to 0.68) | <0.0001 |
| Lower limb injuries | 66 (6.9) | 115 (13.1) | 0.050 | 1.7 | 16 | 0.51 (0.36 to 0.73) | <0.001 |
| Acute knee or ankle injuries: | 46 (4.8) | 76 (8.6) | 0.057 | 1.8 | 26 | 0.53 (0.35 to 0.81) | 0.004 |
| Acute knee injuries | 19 (2.0) | 38 (4.3) | 0.071 | 2.0 | 43 | 0.45 (0.25 to 0.81) | 0.007 |
| Acute ankle injuries | 28 (2.9) | 40 (4.6) | 0.071 | 2.0 | 59 | 0.63 (0.36 to 1.09) | 0.097 |
| Upper limb injuries | 17 (1.8) | 39 (4.4) | 0.071 | 2.0 | 38 | 0.37 (0.20 to 0.69) | 0.002 |
*
Cox model calculated according to method of Lin and Wei,17 which takes cluster randomisation into account.