Baseline characteristics for players included in the intention-to-treat analysis
| Intervention (n=247) | Control (n=242) | P values | |
| Age (years)* | 22.0 (4.3) | 23.7 (4.3) | <0.001 |
| Height (cm)* | 181.9 (6.7) | 182.3 (6.4) | 0.45 |
| Body mass (kg)* | 75.7 (7.5) | 78.0 (7.5) | 0.001 |
| Senior player (years)* | 5.3 (4.1) | 6.2 (4.4) | 0.023 |
| Prevalence (%) | |||
| Groin problems | 32.8 | 32.6 | >0.99 |
| Substantial groin problems | 12.6 | 13.6 | 0.71 |
| HAGOS†‡ | |||
| Pain | 95.0 (15.0) | 95.0 (15.0) | 0.69 |
| Symptoms | 82.1 (25.0) | 82.1 (25.0) | 0.70 |
| Activities of daily living | 100 (5.0) | 100.0 (10.0) | 0.53 |
| Sport and recreational activities | 90.6 (21.9) | 93.8 (21.1) | 0.20 |
| Participation in physical activity | 100.0 (25.0) | 100.0 (12.5) | 0.48 |
| Quality of living | 90.0 (25.0) | 95.0 (25.0) | 0.79 |
| Playing positions | 0.80 | ||
| Goalkeepers | 13% | 11% | |
| Defenders | 31% | 30% | |
| Midfielders | 36% | 35% | |
| Attackers | 20% | 23% | |
| Leg dominance | 0.24 | ||
| Left leg | 17% | 21% | |
| Right leg | 83% | 79% |
*Values expressed as mean (SD).
†Intervention group (n=225), control group (n=216).
‡Values expressed as median (IQR).