Table 2 Mean dental age (±SD), difference between chronological age (CA) and dental age (DA) in years (mean ± SD, median, 1. and 3. quartile and interquartile range) using the Demirjian method

6

6.32 (±0.72)

−0.20

−0.26

−0.53

0.14

0.67

0.078

6.57 (±0.50)

−0.39

−0.37

−0.71

−0.09

−0.80

0.008*

7

7.36 (±0.73)

−0.34

−0.48

−0.66

−0.03

−0.69

0.020*

7.16 (±0.71)

−0.13

−0.28

−0.36

0.03

0.39

0.079

8

8.11 (±0.82)

−0.10

−0.09

−0.53

0.34

0.87

0.866

7.84 (±0.50)

0.12

0,17

−0.08

0.47

0.55

0.142

9

9.00 (±1.15)

0.09

0.26

−0.51

0.98

1.49

0.277

9.03 (±1.02)

−0.01

−0.05

−0.68

0.82

1.50

0.828

10

10.32 (±1.21)

−0.27

−0.28

−1.13

0.39

1.52

0.058

10.41 (±1.44)

−0.40

−0,09

−1.56

0.54

2.10

0.289

11

11.20 (±1.35)

−0.17

−0.24

−0.74

0.71

1.45

0.364

11.48 (±1.22)

−0.43

−0.41

−0.91

0.51

1.42

0.131

12

12.35 (±1.40)

−0.35

−0.24

−1.34

0.35

1.69

0.153

12.30 (±1.57)

−0.29

−0.71

−1.22

0.38

1.60

0.076

13

13.07 (±1.96)

−0.07

−0.48

−1.32

0.91

2.23

0.379

12.73 (±1.51)

0.13

−0.14

−0.97

0.88

1.85

0.632

14

13.90 (±1.54)

−0.05

−0.10

−1.45

1.45

2.90

0.796

14.42 (±0.97)

−0.45

−0.38

−1.03

0.14

1.17

0.099

Total

10.41 (±2.51)

−0.16

−0.21

−0.09

0.58

0.67

0.010*

10.18 (±2.46)

−0.18

−0.22

−0.79

0.47

1.26

0.008*