Predictors: | Demirjian method | ||||
---|---|---|---|---|---|
B | SE B | β | t | 95% CI for B | |
(Constant) | −160.17 | 11.65 | −13.75*** | ||
Lateral Incisor | −5.24 | 1.48 | -.18 | −3.54*** | 0.04 to 0.41 |
Central Incisor | 2.69 | 1.15 | .11 | 2.33* | −0.68 to −0.19 |
Canine | 4.02 | 1.96 | .12 | 2.05* | 0.01 to 0.66 |
1st Premolar | 10.27 | 1.35 | .36 | 7.59*** | 0.63 to 1.08 |
2nd Premolar | −0.35 | 1.83 | -.01 | −0.19 | −0.33 to 0.27 |
1st Molar | 0.26 | 0.76 | .01 | 0.34 | −0.10 to 0.15 |
2nd Molar | 12.28 | 1.29 | .46 | 9.52*** | 0.81 to 1.23 |
Rmultiple = .759, R 2 = .577, SEE = 2.95, F(7,813) = 158.08, p < 0.001 | |||||
Predictors: | Nolla method | ||||
(Constant) | 67.29 | 19.72 | 3.41** | ||
Lateral Incisor | 0.49 | 2.31 | .01 | 0.21 | −1.20 to - 0.18 |
Central Incisor | −8.27 | 3.12 | -.09 | −2.65** | −0.34 to 0.42 |
Canine | 7.48 | 2.85 | .16 | 2.62** | 0.16 to 1.09 |
1st Premolar | −11.34 | 2.78 | -.31 | −4.08*** | −1.40 to −0.49 |
2nd Premolar | 15.32 | 2.50 | .47 | 6.13*** | 0.87 to 1.69 |
1st Molar | −12.68 | 2.97 | -.17 | −4.27*** | −1.54 to −0.57 |
2nd Molar | 23.25 | 1.73 | .72 | 13.47*** | 1.66 to 2.22 |
Rmultiple = .863, R 2 = .745, SEE = 2.30, F(7,813) = 339.62, p < 0.001 | |||||
Equations forecasting chronological age through the significant teeth: | |||||
Demirjian’s formula (5 significant teeth): | Nolla’s formula (6 significant teeth): | ||||
Predicted chron. age = −158.77 + 2.68 × Central Incisor - 5.20 × Lateral Incisor + 3.95 × Canine + 10.22 × First Premolar + 12.25 × Second Molar | Predicted chron. age = 67.07 - 7.95 × Central Incisor + 7.57 × Canine − 11.29 × First Premolar + 15.29 × Second Premolar – 12.58 × First Molar + 23.24 × Second Molar |