Table 1.
Player and injury characteristics of the control (CON) and intervention (INT) groups
| CON | INT | |
|---|---|---|
| Number of teams | 115 | 128 |
| Number of players | 1829 | 2066 |
| Age [years] | 10.7 (1.4) | 10.8 (1.4) |
| Body height [m] | 1.44 (0.10) | 1.45 (0.11) |
| Body mass [kg] | 36.4 (8.5) | 36.3 (8.5) |
| BMI [kg/m2] | 17.3 (2.5) | 17.1 (2.4) |
| Total exposure [h] | 152,033 | 140,716 |
| Match exposure [h] | 23,813 | 19,769 |
| Training exposure [h] | 128,220 | 120,947 |
| Number of total injuries | 235 | 139 |
| Number of match injuries | 115 | 71 |
| Number of training injuries | 120 | 68 |
| Total number of injured players | 184 | 119 |
| Number of players with 1 injury | 149 | 102 |
| Number of players with 2 injuries | 22 | 14 |
| Number of players with 3 injuries | 10 | 3 |
| Number of players with 4 injuries | 3 | 0 |
| Number of “recurrent” injuriesa | 15 | 6 |
| Number of injuries by time loss (%) | ||
| No time loss | 18 (7.7) | 8 (5.8) |
| 1–3 days | 37 (15.7) | 23 (16.5) |
| 4–7 days | 52 (22.1) | 41 (29.5) |
| 8–28 days | 78 (33.2) | 46 (33.1) |
| >28 days | 50 (21.3) | 21 (15.1) |
| Sum of days lost to injury Mean lay-off time with 95% CI [days] |
4201 17.9 [15.0–20.8] |
2026 14.6 [11.6–17.6] |
BMI body mass index, CI confidence interval
aRe-injury of the same body part (e.g. “a second sprain of the left ankle”)