Table 2

Incidence rate ratios by injury type based on Poisson regression analysis adjusted for cluster and covariates (previous injury and age group)

Study group injury typeNo of playersNo of player hoursNo of injuriesInjury rate (no of injuries/1000 player-hours) (95% CI)Incidence rate ratio (cluster-adjusted and adjusted for covariates) (95% CI)p Value
All injury
 Control36423 597793.35 (2.65 to 4.17)0.62 (0.39 to 0.99)0.045*
 Training38024 051502.08 (1.54 to 2.74)
Acute injury
 Control36423 597723.05 (2.39 to 3.84)0.57 (0.35 to 0.91)0.018*
 Training38024 051421.75 (1.26 to 2.34)
Lower-extremity injury
 Control36423 597602.54 (1.94 to 3.27)0.68 (0.42 to 1.11)0.126
 Training38024 051421.75 (1.26 to 2.36)
Ankle sprain
 Control36423 597271.14 (0.75 to 1.66)0.5 (0.24 to 1.04)0.065
 Training38024 051140.58 (0.32 to 0.98)
Knee sprain
 Control36423 59780.34 (0.15 to 0.67)0.38 (0.08 to 1.75)0.232
 Training38024 05130.12 (0.03 to 0.36)