Comparison of game related injury rates in the NMC intervention and sham (control) PAFIX trial groups
| Number of injuries | Number of hours spent in games | IIR per 1000 game hours (95% confidence limits)* | IRR (95% confidence limits) unadjusted for clustering effects | Intraclass correlation | Cluster-adjusted IRR (95% confidence limits) | Post hoc power for the cluster-adjusted IRR | |
|---|---|---|---|---|---|---|---|
| All injuries | |||||||
| NMC | 335 | 12 790 | 26.2 (23.5, 29.2) | 0.93 (0.81, 1.07) p=0.31 | 0.0117 | 0.92 (0.68, 1.23) p=0.57 | 9% |
| Control | 438 | 15 537 | 28.2 (25.6, 31.0) | ||||
| All | 773 | 28 327 | 27.3 (25.4, 29.3) | ||||
| Lower limb (knee, ankle, lower leg and thigh) | |||||||
| NMC | 151 | 12 790 | 11.8 (10.0, 13.8) | 0.80 (0.65, 0.99) p=0.038 | 0.0007 | 0.78 (0.56, 1.08) p=0.14 | 45% |
| Control | 228 | 15 537 | 14.7 (12.8, 16.7) | ||||
| All | 379 | 28 327 | 13.4 (12.1, 14.8) | ||||
| Knee | |||||||
| NMC | 32 | 12 790 | 2.5 (1.7, 3.5) | 0.65 (0.42, 0.99) p=0.046 | 0.0132 | 0.50 (0.24, 1.05) p=0.07 | 60% |
| Control | 60 | 15 537 | 3.9 (2.9, 5.0) | ||||
| All | 92 | 28 327 | 3.2 (2.6, 4.0) | ||||
IRR, injury incidence rate; NMC, neuromuscular control; PAFIX, Preventing Australian Football Injuries through Exercise.