Operational definitions
| Training session | Team training that involved physical activity under the supervision of the coaching staff |
| Match | Competitive or friendly match against another team |
| Hip/groin injury | Injury located to the hip joint or surrounding soft tissues or at the junction between the anteromedial part of the thigh, including the proximal part of the adductor muscle bellies, and the lower abdomen resulting from playing football and leading to a player being unable to fully participate in future training or match play (ie, time-loss injury) |
| Rehabilitation | A player was considered injured until club medical team allowed full participation in training and availability for match selection |
| Reinjury | Injury of the same type and location as a previous injury that occurred within 2 months of a player’s return to full participation |
| Minimal injury | Injury causing absence of 1–3 days from training and match play |
| Mild injury | Injury causing absence of 4–7 days from training and match play |
| Moderate injury | Injury causing absence of 8–28 days from training and match play |
| Severe injury | Injury causing absence of over 28 days from training and match play |
| Traumatic injury | Injury with sudden onset and known cause |
| Overuse injury | Injury with insidious onset and no known trauma |
| Injury incidence | No of injuries per 1000 player hours [(Σ injuries/Σ exposure hours) ×1000] |
| Dominant leg | Preferred kicking leg |