Table 1 Characteristics of participants with or without dental injury
Variables | Â | Dental injury | Â | |
|---|---|---|---|---|
| Â | Non-injured, n (%) | Injured, n (%) | Â | |
Total | 4972 (86.7) | 763 (13.3) | p value | |
Sex | Males | 3540 (85.7) | 592 (14.3) | <0.001 |
Females | 1432 (89.3) | 171 (10.7) | Â | |
Grade | Elementary school | 3926 (86.7) | 604 (13.3) | 0.900 |
Junior high school | 1046 (86.8) | 159 (13.2) | Â | |
BMI | Underweight | 3327 (86.2) | 532 (13.8) | 0.238 |
Normal weight | 1508 (87.5) | 215 (12.5) | Â | |
Overweight | 137 (89.5) | 16 (10.5) | Â | |
Sport | Baseball | 1333 (86.8) | 202 (13.2) | 0.989 |
Soccer | 1051 (86.4) | 166 (13.6) | Â | |
Volleyball | 464 (87.1) | 69 (12.9) | Â | |
Basketball | 1083 (87.1) | 161 (12.9) | Â | |
Judo | 175 (85.8) | 29 (14.2) | Â | |
Kendo | 339 (85.6) | 57 (14.4) | Â | |
Karate | 160 (87.4) | 23 (12.6) | Â | |
Handball | 28 (82.4) | 6 (17.6) | Â | |
Tennis | 96 (85.0) | 17 (15.0) | Â | |
Athletics | 97 (85.8) | 16 (14.2) | Â | |
Table Tennis | 57 (89.1) | 7 (10.9) | Â | |
Badminton | 89 (89.9) | 10 (10.1) | Â | |
Contact sport | Non-contact | 339 (87.1) | 50 (12.9) | 0.960 |
Limited-contact | 2868 (87.0) | 430 (13.0) | Â | |
Semi-contact | 508 (86.2) | 81 (13.8) | Â | |
Full-contact | 1257 (86.2) | 202 (13.8) | Â | |
Team level | Local competition | 2844 (87.2) | 416 (12.8) | 0.019 |
Prefectural competition | 1752 (86.8) | 267 (13.2) | Â | |
District competition | 376 (82.5) | 80 (17.5) | Â | |
Experience (years) | ≤1 | 2138 (87.4) | 309 (12.6) | 0.428 |
>1 to <5 | 2269 (86.2) | 363 (13.8) | Â | |
≥5 | 565 (86.1) | 91 (13.9) |  | |
Training days per week | <3 | 2846 (87.2) | 417 (12.8) | 0.179 |
≥3 | 2126 (86.0) | 346 (14.0) |  | |
Enjoyment in playing sport | Yes | 4880 (86.8) | 739 (13.2) | 0.018 |
No | 92 (79.3) | 24 (20.7) | Â | |
The time for breaks | Sufficient | 4453 (87.1) | 662 (12.9) | 0.007 |
Insufficient | 499 (83.2) | 101 (16.8) | Â | |
Verbal abuse from coaches | No | 3954 (87.6) | 559 (12.4) | <0.001 |
Yes | 1018 (83.3) | 204 (16.7) | Â | |
Physical punishment from coaches | No | 4388 (87.4) | 634 (12.6) | <0.001 |
Yes | 584 (81.9) | 129 (18.1) | Â | |
Screen time per day (hours) | ≤3 | 1772 (86.7) | 273 (13.3) | 0.168 |
>3 to <5 | 1836 (87.5) | 263 (12.5) | Â | |
≥5 | 1364 (85.7) | 227 (14.3) |  | |
Sleep time per day (hours) | ≤8.5 | 1725 (85.9) | 284 (14.1) | 0.384 |
>8.5 to <9 | 1009 (87.0) | 151 (13.0) | Â | |
≥9 | 2238 (87.2) | 328 (12.8) |  | |