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Table 3 Chronological age predicted by the teeth assessed by the Demirjian and Nolla scores

From: The accuracy of estimating chronological age from Demirjian and Nolla methods in a Portuguese and Spanish sample

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

  1. *p < .05; **p < .01; ***p < .001.