Table 7.
Regression formulae for each system according to the developmental score of third molars within the same jaw.
| Male |
Female |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Criteria | Regression formula | RMSE | Adj. R2 | Regression formula | RMSE | Adj. R2 | ||||||||||
| DMJ | Age = | 6.4414 | + | (UR × 0.9750) | + | (UL × 0.9733) | 1.31 | 0.744 | Age = | 8.9117 | + | (UR × 1.0534) | + | (UL × 0.6513) | 1.26 | 0.764 |
| KHL | Age = | 10.5118 | + | (UR × 0.7281) | + | (UL × 0.3872) | 1.34 | 0.730 | Age = | 11.4052 | + | (UR × 0.5823) | + | (UL × 0.5150) | 1.37 | 0.724 |
| TVS | Age = | 10.9477 | + | (UR × 0.7682) | + | (UL × 0.3028) | 1.36 | 0.725 | Age = | 11.6990 | + | (UR × 0.5764) | + | (UL × 0.4997) | 1.37 | 0.723 |
| LVD | Age = | 6.6060 | + | (UR × 0.5422) | + | (UL × 0.4652) | 1.42 | 0.696 | Age = | 8.7374 | + | (UR × 0.4355) | + | (UL × 0.4629) | 1.33 | 0.737 |
| DMJ | Age = | 6.5865 | + | (LL × 0.4229) | + | (LR × 1.5449) | 1.32 | 0.739 | Age = | 9.7264 | + | (LL × 0.6788) | + | (LR × 0.9443) | 1.35 | 0.717 |
| KHL | Age = | 10.2914 | + | (LL × 0.3764) | + | (LR × 0.7817) | 1.34 | 0.730 | Age = | 11.7638 | + | (LL × 0.4828) | + | (LR × 0.5846) | 1.38 | 0.708 |
| TVS | Age = | 11.1369 | + | (LL × 0.2376) | + | (LR × 0.8271) | 1.34 | 0.730 | Age = | 12.2561 | + | (LL × 0.4073) | + | (LR × 0.6183) | 1.39 | 0.705 |
| LVD | Age = | 6.4973 | + | (LL × 0.3582) | + | (LR × 0.6769) | 1.50 | 0.663 | Age = | 9.7217 | + | (LL × 0.4106) | + | (LR × 0.4234) | 1.40 | 0.697 |
UR, upper right third molar score; UL, upper left third molar score; LL, lower left third molar score; LR, lower right third molar score; DMJ, Demirjian; KHL, Köhler; TVS, Thevissen; LVD, Liversidge; RMSE, root mean square error; Adj. R2, adjusted R2; all P-values were less than 0.05 (P < 0.05).