Table 5.
Dental injuries incurred by junior high school students (girls) during participation in various sports
| Variable | n (%) | Dental injury | Injury rate* | RR2† (95% CI) | P-value |
|---|---|---|---|---|---|
| Total number of students‡ | 255,702 (100) | 186§ | 0.73 | 1 | |
| Sport | |||||
| Swimming | 3,067 (1.2) | 3 | 0.98 | 1.3 (0.4–4.2) | 0.61 |
| Gymnastics | 1,666 (0.7) | 0 | – | – | – |
| Track and field | 12,073 (4.7) | 5 | 0.41 | 0.6 (0.2–1.4) | 0.21 |
| Soccer | 535 (0.2) | 1 | 1.87 | 2.6 (0.4–18.3) | 0.35 |
| Tennis | 32,632 (12.8) | 17 | 0.52 | 0.7 (0.4–1.2) | 0.19 |
| Softball | 13,245 (5.2) | 13 | 0.98 | 1.3 (0.8–2.4) | 0.30 |
| Baseball | 199 (0.08) | 0 | – | – | – |
| Handball | 4,225 (1.7) | 12 | 2.84 | 3.9 (2.2–7.0) | <0.001 |
| Volleyball | 30,539 (11.9) | 37 | 1.21 | 1.7 (1.2–2.4) | <0.01 |
| Basketball | 22,690 (8.9) | 47 | 2.07 | 2.9 (2.1–3.9) | <0.001 |
| Table tennis | 17,847 (7.0) | 3 | 0.17 | 0.2 (0.1–0.7) | <0.05 |
| Badminton | 7,761 (3.0) | 3 | 0.39 | 0.5 (0.2–1.7) | 0.28 |
| Judo | 1,866 (0.7) | 2 | 1.07 | 1.5 (0.4–5.9) | 0.59 |
| Kendo | 7,196 (2.8) | 4 | 0.56 | 0.8 (0.3–2.1) | 0.59 |
| Sumo | 2 (0.001) | 0 | – | – | – |
| Skiing | 148 (0.06) | 0 | – | – | – |
95% CI, 95% confidence interval; n, number of students; RR2, rate ratio.
*
Per 1,000 students.
†
[(total number of dental injuries incurred during participation in each sport / total number of participants in each sport) × 1,000] ÷ [(total number of dental injuries occurring outside school sports clubs / total number of students) × 1,000].
‡
Students who had and had not joined the school sports club.
§
Outside school sports clubs.