Table 3.

Summary of risk factors for all injuries

	Extrinsic	Intrinsic
Non-modifiable	Position [31, 50, 51] Playing level [18, 20, 22, 25, 26, 31, 44, 51] Exposure type* [32] Season [26] Time in game** [26, 27] Surface type [28, 49]	Sex [16, 32, 38] Age (year or group) [21, 26, 31, 38, 44, 55–61] Height [31, 44] Weight [31, 44] Previous injury history [31, 44] Previous concussion history [31, 44] Previous playing experience [31] Previous shoulder injury [51]
Modifiable	Equipment use*** [31, 44, 62, 63] Days between games [28] Match and training volume [34]	Regular weight training [31, 44] Upper body strength [31] Lower body strength [31] Regular protein supplementation [44]

*Exposure type: match, training.

**Time in game: by quarters.

***Equipment: mouthguard, padded headgear, shoulder pads