Demographic characteristics of the study population
| Variables | n=571 |
| Age (years) | 14.3±2.5 |
| Males, n (%) | 350 (61.3) |
| Caucasian ethnicity, n (%) | 559 (97.9) |
| Asymptomatic, n (%) | 284 (49.7) |
| Mild symptomatic, n (%) | 287 (50.3) |
| Fever, n (%) | 183 (63.8) |
| Cough, n (%) | 49 (17.1) |
| Asthenia, n (%) | 70 (24.4) |
| Ageusia, n (%) | 98 (34.1) |
| Anosmia, n (%) | 98 (34.1) |
| Diarrhoea, n (%) | 16 (5.6) |
| Headache, n (%) | 53 (18.5) |
| Cardiac symptoms | |
| Chest pain, n (%) | 2 (0.4) |
| Symptom duration (days) | 4±1 |
| Evaluation time from negativisation | |
| <15 days, n (%) | 10 (1.7) |
| 16–30 days, n (%) | 58 (10.2) |
| 31–45 days, n (%) | 503 (88.1) |
| BSA (m2) | 1.62±0.01 |
| BMI (kg/m2) | 20.9±0.14 |
| Type of sport | |
| Endurance (%) | 4.2 |
| Mixed (%) | 87.7 |
| Power (%) | 6.9 |
| Skill (%) | 1.2 |
BMI, body mass index; BSA, body surface area.