Years of football activity, militancy in the current team” and years of play in the current category by type of playing field
| Variable | Hard court | Natural grass | Synthetic grass | Total | Test | P value |
| Football activity (years) | 13.3±4.8 (5.0–30.0) | 14.1±4.4 (6.0–26.0) | 14.3±5.0 (2.0–30.0) | 14.3±5.0 (2.0–30.0) | F=4.4 | 0.014 |
| Militancy in the current team (years) | 2.4±2.3 (1.0–12.0) | 2.3±2.0 (1.0–13.0) | 2.0±2.0 (1.0–12.0) | 2.2±2.1 (1.0–13.0) | k=2.3 | 0.309 |
| Play in the current category (yrs) | 2.3±2.2 (1.0–12.0) | 2.7±2.4 (1.0–10.0) | 1.8±1.6 (1.0–10.0) | 2.3±2.1 (1.0–12.0) | k=6.5 | 0.039 |
Values are mean±SD (range).