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Table 7 Chronological age (years) predicted by the Demirjian and Nolla methods for three age-groups for females

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

Age-group

 

Demirjian

Age-group

Nolla

B

SE B

β

t

B

SE B

β

t

4 to 8 years

Constant

2.23

0.52

 

4.31***

4 to 10 years

-3.49

0.58

 

-5.99***

Predictor

0.06

0.01

.74

9.33***

 

0.21

0.01

.85

20.66***

R = .742, R2 = .551, SEE = 0.67

R = .852, R2 = .726, SEE = 0.81

F(1,71) = 87.05, p < .001

F(1,161) = 417.78, p < .001

95% confidence interval for B: .045 to .074

95% confidence interval for B: .191 to .232

Predicted chron. age = 2.23 + 0. 06 x Demirjian’s score

Predicted chron. age = -3.49 + 0.21 x Nolla’s score

9 to 14 years

Constant

-20.66

2.17

 

-9.51***

11 to 15 years

-14.18

2.42

 

-5.85***

Predictor

0.33

0.02

.72

14.72***

0.40

0.04

.69

11.18***

R = .715, R2 = .511, SEE = 1.17

R = .689, R2 = .475, SEE = 1.00

F(1,207) = 216.71, p< .001

F(1,138) = 124.95, p < .001

95% confidence interval for B: .288 to .376

95% confidence interval for B: .330 to .472

Predicted chron. age = -20.66 + 0.33 x Demirjian’s score

Predicted chron. age = -14.18 + 0.40 x Nolla’s score

15 to 18 years

Constant

-103.39

32.59

 

-3.17**

16 to 19 years

-4.85

15.33

 

-0.32

Predictor

1.20

0.33

.42

3.66**

0.32

0.22

0.192

1.44

R = .422, R2 = .178, SEE = 0.97

R = .192, R2 = .037, SEE = 1.25

F(1,62) = 13.44, p = .001

F(1,54) = 2.07, p = .156

95% confidence interval for B: .608 to 1.79

95% confidence interval for B: -.125 to .759

Predicted chron. age = -103.39 + 1.20 x Demirjian’s score

(Nolla method not statistically significant, p > .05)

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