Table 3. | The prevalence of dental erosion according to swimming training duration and hours spent per week in a swimming pool |
| Groups | Training duration (years) | χ2; d.f.; P-value | ||
|---|---|---|---|---|
| < 5 | 5 - 10 | > 10 | ||
| N (%) | N (%) | N (%) | ||
| Group 1 (n = 76) | 5 (20.8) | 13 (27.7) | 1 (20) | χ2 = 0.466; d.f. = 2; P = 0.792 |
| Group 2 (n = 56) | 1 (50) | 5 (45.5) | 22 (51.2) | χ2 = 0.114; d.f. = 2; P = 0.945 |
| Groups | Hours spent per week in the swimming pool (h) | χ2; d.f.; P-value | ||
| < 4 | 4 - 6 | > 6 | ||
| Group 1 (n = 76) | 2 (18.2) | 4 (30.8) | 13 (25) | χ2 = 0.503; d.f. = 2; P = 0.777 |
| Group 2 (n = 56) | 7 (41.2) | 6 (50) | 15 (55.6) | χ2 = 0.863; d.f. = 2; P = 0.65 |
χ2 = Chi-square test; d.f. = degree of freedom. |
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