Table 2.

Incidence rate ratios by injury stratification (all injury, targeted injury) based on Poisson regression analysis adjusted for cluster and playing level

	Arm	Clubs (n)	Player match-hours	Injuries/days lost count	Rate per 1000 player match-hours (90% CI)	RR (90% CI)	Magnitude-based inference (beneficial/trivial/harmful) (%)
Overall Injury
All incidence	Control	19	9660	133	13.8 (11.9 to 15.9)	0.9 (0.6 to 1.3)	Unclear (51/31/18)
	Intervention	22	9900	122	12.3 (10.6 to 14.3)
Severe incidence	Control	19	9660	73	7.6 (6.2 to 9.2)	0.8 (0.6 to 1.3)	Unclear (63/25/12)
	Intervention	22	9900	62	6.3 (5.1 to 7.7)
Injury burden	Control	19	9660	6918	716 (621 to 826)	0.8 (0.5 to 1.4)	Unclear (62/22/16)
	Intervention	22	9900	5783	584 (503 to 678)
Targeted injury
Injury incidence	Control	19	9660	96	9.9 (8.4 to 11.8)	0.6 (0.4 to 1.0)	Likely beneficial (92/7/1)
	Intervention	22	9900	62	6.3 (5.1 to 7.7)
Severe incidence	Control	19	9660	56	5.8 (4.7 to 7.2)	0.6 (0.3 to 1.0)	Likely beneficial (92/6/2)
	Intervention	22	9900	33	3.3 (2.5 to 4.4)
Injury burden	Control	19	9660	5288	547 (463 to 647)	0.6 (0.3 to 1.3)	Unclear (80/11/9)
	Intervention	22	9900	3472	351 (285 to 432)