Details of background data of lower extremity injured athletes caused by specific sports
| Soccer | Basketball | Track and field | Baseball | Volleyball | |
| Sex, n (%) | |||||
| Male | 291 (93.9) | 119 (53.8) | 97 (46.2) | 164 (95.9) | 10 (10.2) |
| Female | 19 (6.1) | 102 (46.2) | 113 (53.9) | 7 (4.1) | 88 (89.8) |
| Types of injury, n (%) | |||||
| Acute injury | 119 (38.4) | 68 (30.8) | 45 (21.4) | 36 (21.1) | 30 (30.6) |
| Chronic disorders | 191 (61.6) | 153 (69.2) | 165 (78.6) | 135 (78.9) | 68 (69.4) |
| Body mass index | 18.8 (2.5) | 18.5 (3.1) | 18.9 (3.0) | 19.3 (2.9) | 19.4 (2.3) |
| Body height increase over the past year, mean cm (SD) | 5.2 (3.0) | 4.7 (2.5) | 4.5 (2.9) | 5.4 (2.9) | 3.7 (2.4) |
| Practice time per week, mean h (SD) | 12.4 (5.1) | 13.8 (5.4) | 14.0 (5.6) | 20.2 (10.1) | 14.7 (6.2) |
| Athlete experience, mean years (SD) | 5.4 (2.4) | 3.6 (2.5) | 3.1 (2.5) | 5.1 (2.3) | 3.8 (2.2) |
| Injury mechanism, n (%) | |||||
| Contact | 96 (31.0) | 51 (23.1) | 5 (2.4) | 9 (5.3) | 16 (16.3) |
| Non-contact | 214 (69.0) | 170 (76.9) | 205 (97.6) | 162 (94.7) | 82 (83.7) |
| History of visiting other medical centres, n (%) | |||||
| Yes | 105 (33.9) | 105 (47.5) | 94 (44.8) | 59 (65.5) | 44 (44.9) |
| No | 205 (66.1) | 116 (52.5) | 116 (55.2) | 112 (65.5) | 54 (55.1) |
| Competitions over the past year, n (%) | |||||
| Regional tournament | 208 (67.1) | 182 (82.4) | 94 (44.8) | 127 (74.3) | 71 (72.4) |
| Prefectural tournament | 81 (26.1) | 36 (16.3) | 103 (49.0) | 37 (21.6) | 18 (18.4) |
| National tournament | 10 (6.5) | 2 (0.9) | 13 (6.2) | 6 (3.5) | 9 (9.2) |
| World competition | 1 (0.3) | 1 (0.5) | 0 (0.0) | 1 (0.6) | 0 (0.0) |
| Future goals, n (%) | |||||
| To discontinue sports | 162 (52.2) | 160 (72.4) | 165 (78.6) | 112 (65.5) | 70 (71.4) |
| To achieve a recreational level | 45 (14.5) | 36 (16.3) | 15 (7.1) | 13 (7.6) | 16 (16.3) |
| To become a professional athlete | 92 (29.7) | 22 (10.0) | 21 (10.0) | 35 (20.5) | 7 (7.1) |
| To become a coaching staff | 11 (3.5) | 3 (1.4) | 9 (4.3) | 11 (6.4) | 5 (5.1) |
| Occurrence of new injuries after lower extremity injury, n (%) | |||||
| Yes | 146 (47.1) | 137 (62.0) | 88 (41.9) | 85 (49.7) | 40 (40.8) |
| No | 164 (52.9) | 84 (38.0) | 122 (58.1) | 86 (50.3) | 58 (59.2) |