Table 4.

Numbers and severity of injuries

	Intervention group (n=958)	Control group (n=879)	Rate ratio (95% CI)*	P value (z test)
All injuries:	103	195	0.49 (0.39 to 0.63)	<0.0001
Match	56	112	0.48 (0.35 to 0.66)	<0.0001
Training	47	83	0.53 (0.37 to 0.75)	<0.001
Slight	4	8	0.47 (0.14 to 1.55)	0.21
Minor	47	62	0.71 (0.48 to 1.03)	0.07
Moderate	20	56	0.33 (0.20 to 0.55)	<0.0001
Major	32	69	0.43 (0.28 to 0.66)	<0.0001
Overuse injuries:	18	39	0.43 (0.25 to 0.75)	0.003
Slight	0	3	—	—
Minor	4	9	0.41 (0.13 to 1.35)	0.14
Moderate	7	12	0.54 (0.21 to 1.38)	0.2
Major	7	15	0.44 (0.18 to 1.07)	0.07
Acute injuries:	85	156	0.51 (0.39 to 0.66)	<0.0001
Slight	4	5	0.76 (0.20 to 2.78)	0.66
Minor	43	53	0.75 (0.51 to 1.13)	0.17
Moderate	13	44	0.28 (0.15 to 0.51)	<0.0001
Major	25	54	0.43 (0.27 to 0.69)	0.001
Contact	51	82	0.58 (0.41 to 0.82)	0.002
Non-contact	34	74	0.43 (0.29 to 0.64)	<0.0001
Acute knee or ankle injuries:	48	81	0.55 (0.39 to 0.79)	0.001
Slight	3	3	0.93 (0.19 to 4.62)	0.93
Minor	22	25	0.82 (0.46 to 1.46)	0.5
Moderate	8	25	0.30 (0.13 to 0.66)	0.003
Major	15	28	0.50 (0.27 to 0.94)	0.03
Knee ligament injuries	3†‡	14‡§	0.20 (0.06 to 0.70)	0.01
Meniscus injuries	2	7	0.27 (0.06 to 1.28)	0.1
Players with two or more injuries	8	19	0.39 (0.17 to 0.90)	0.03
Re-injury¶	0	3	—	—

^*Rate ratio obtained from Poisson model.

^†Anterior cruciate ligament: n=3.

^‡Anterior cruciate ligament (n=10), posterior cruciate ligament (n=3), medial collateral ligament (n=1).

^§10 of the 16 ligament injuries to the cruciate ligament also included concomitant injuries to the medial collateral ligament, lateral collateral ligament, bone bruise, or meniscus injuries, or a combination of these.

^¶Same type and location of injury.