Exposure and hamstring injury data in teams where all players performed the Nordic Hamstring Exercise (NHE) (n=5) and teams where only some players performed NHE (n=6)
| Team training (n=5) Median (IQR) | No team training (n=6) | |
| Training exposure hours | 3753 (3729–5425) | 5609 (4900–5995) |
| Match exposure hours | 829 (759–877) | 694 (591–731) |
| Total exposure hours | 4513 (4426–6543) | 6328 (5641–6676) |
| Training hamstring injuries | 2 (2–3) | 5 (3–5) |
| Match hamstring injuries | 1 (1–2) | 3 (0–4) |
| Total hamstring injuries | 4 (3–4) | 7 (5–10) |
| Hamstring injury burden | 10 (7–12) | 16 (9–26) |
| Total lay-off days following training hamstring injuries during the 2020–21 season | 13 (11–42) | 49 (23–56) |
| Total lay-off days following match hamstring injuries during the 2020–21 season | 31 (11–42) | 35 (0–126) |
| Total lay-off days absence following all hamstring injuries during the 2020–21 season | 76 (31–84) | 90 (56–149) |
Hamstring injury burden is expressed as the number of lay-off days per 1000 player hours.