Table 6.
Chronological age (years) predicted by the Demirjian and Nolla methods for three age-groups for males
| Age-group | Demirjian | Age-group | Nolla | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| B | SE B | β | t | B | SE B | β | t | |||
| 4 to 8 years | Constant | 2.87 | 0.43 | 6.66*** | 4 to 10 years | -3.11 | 0.56 | -5.52*** | ||
| Predictor | 0.06 | 0.01 | .73 | 10.09*** | 0.21 | 0.01 | .85 | 20.29*** | ||
| R = .732, R2 = .537, SEE = 0.66 | R = .849, R2 = .721, SEE = 0.77 | |||||||||
| F(1,88) = 101.87, p < .001 | F(1,159) = 411.73, p < .001 | |||||||||
| 95% confidence interval for B: .047 to .070 | 95% confidence interval for B: .190 to .231 | |||||||||
| Predicted chron. age = 2.87 + 0. 60 x Demirjian’s score | Predicted chron. age = -3.11+ 0.21 x Nolla’s score | |||||||||
| 9 to 14 years | Constant | -9.21 | 1.55 | -5.93*** | 11 to 15 years | -4.54 | 1.38 | -3.28** | ||
| Predictor | 0.22 | 0.02 | .68 | 13.43*** | 0.27 | 0.02 | .70 | 12.69*** | ||
| R = .679, R2 = .461, SEE = 1.23 | R = .698, R2 = .487, SEE = 0.93 | |||||||||
| F(1,211) = 180.40, p < .001 | F(1,170) = 161.11, p < .001 | |||||||||
| 95% confidence interval for B: .189 to .254 | 95% confidence interval for B: .224 to .306 | |||||||||
| Predicted chron. age = -9.21 + 0.22 x Demirjian’s score | Predicted chron. age = -4.54 + 0.27 x Nolla’s score | |||||||||
| 15 to 18 years | Constant | -5.68 | 7.14 | -0.80 | 16 to 19 years | -12.89 | 14.68 | -0.88 | ||
| Predictor | 0.22 | 0.07 | .35 | 3.03** | 0.43 | 0.21 | .29 | 2.04* | ||
| R = .345, R2 = .119, SEE = 1.13 | R = .289, R2 = .083, SEE = 1.16 | |||||||||
| F(1,68) = 9.19, p = .003 | F(1,46) = 4.18, p = .047 | |||||||||
| 95% confidence interval for B: .074 to .361 | 95% confidence interval for B: .007 to .857 | |||||||||
| Predicted chron. age = -5.68 + 0.22 x Demirjian’s score | Predicted chron. age = -12.89+ 0.43 x Nolla’s score | |||||||||
**p < .01; ***p < .001.