Table 4.

Comparison of hamstring injury incidences between teams in which all players performed the Nordic hamstring exercise (NHE) (n=5) and teams in which only some players performed NHE (n=11)

	Team training (n=5)	Individual training (n=11)	Rate ratio	P value
Training hamstring injury incidence, injuries/1000 hours (95% CI)	0.7 (0.4 to 1.1)	1.0 (0.7 to 1.3)	0.67 (0.38 to 1.20)	0.182
Match hamstring injury incidence, injuries/1000 hours (95% CI)	2.3 (1.3 to 4.1)	6.5 (5.2 to 8.2)	0.36 (0.20 to 0.66)	0.001
Hamstring injury recurrence incidence, injuries/1000 hours (95% CI)	0.1 (0.0 to 0.3)	0.4 (0.3 to 0.6)	0.19 (0.04 to 0.70)	0.025