Table 1. Comparison of the fracture presence/absence distribution by education level, jaw, and tooth type.
| Variables | Fractured instrument | p * | ||
|---|---|---|---|---|
| Presence | Absent | |||
| Education level | 0.051 | |||
| Postgraduate student | 38 (3.2) | 1,167 (96.8) | ||
| Fourth-year student | 9 (2.4) | 364 (97.6) | ||
| Fifth-year student | 32 (5.4) | 558 (94.6) | ||
| Arch | 0.922 | |||
| Mandibula | 40 (3.7) | 1,046 (96.3) | ||
| Maxilla | 39 (3.6) | 1,043 (96.4) | ||
| Tooth type | < 0.001 | |||
| Incisor | 6 (0.9)a | 648 (99.1) | ||
| Premolar | 15 (2.2)a | 662 (97.8) | ||
| Molar | 58 (6.9)b | 779 (93.1) | ||
Values are presented as number of patients (%).
*Pearson χ2 test; a,bThere is no difference between rows with the same letter.