Table 6.
Dental injuries incurred by high school students (boys) during participation in various sports
| Variable | n (%) | Dental injury | Injury rate* | RR2† (95% CI) | P-value |
|---|---|---|---|---|---|
| Total number of students‡ | 244,804 (100) | 212§ | 0.87 | 1 | |
| Sport | |||||
| Swimming | 3,112 (1.3) | 1 | 0.32 | 0.4 (0.1–2.6) | 0.32 |
| Gymnastics | 528 (0.2) | 0 | – | – | – |
| Track and field | 9,680 (4.0) | 3 | 0.31 | 0.4 (0.1–1.1) | 0.08 |
| Soccer | 21,315 (8.7) | 42 | 1.97 | 2.3 (1.6–3.2) | <0.001 |
| Tennis | 21,596 (8.8) | 5 | 0.23 | 0.3 (0.1–0.7) | <0.01 |
| Softball | 738 (0.3) | 1 | 1.36 | 1.6 (0.2–11.2) | 0.66 |
| Baseball | 23,835 (9.7) | 128 | 5.37 | 6.2 (5.0–7.7) | <0.001 |
| Handball | 5,667 (2.3) | 19 | 3.35 | 3.9 (2.4–6.2) | <0.001 |
| Volleyball | 7,811 (3.2) | 18 | 2.3 | 2.7 (1.6–4.3) | <0.001 |
| Basketball | 14,656 (6.0) | 57 | 3.89 | 4.5 (3.4–6.0) | <0.001 |
| Rugby | 3,795 (1.6) | 24 | 6.32 | 7.3 (4.8–11.1) | <0.001 |
| Table tennis | 9,706 (4.0) | 1 | 0.10 | 0.1 (0.02–0.8) | <0.05 |
| Badminton | 6,711 (2.7) | 0 | – | – | – |
| Judo | 4,344 (1.8) | 0 | – | – | – |
| Kendo | 5,495 (2.2) | 14 | 2.55 | 2.9 (1.7–5.0) | <0.001 |
| Sumo | 187 (0.08) | 3 | 16.04 | 18.5 (6.0–57.4) | <0.001 |
| Climbing | 702 (0.3) | 1 | 1.42 | 1.6 (0.2–11.7) | 0.62 |
| Boat | 520 (0.2) | 0 | – | – | – |
| Skiing | 233 (0.1) | 1 | 4.29 | 5.0 (0.7–35.2) | 0.11 |
| Skating | 65 (0.03) | 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.