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Table 4 Age distribution of participants according to Demirjian and Solari root development stage of tooth 38 (n = 671)

From: Determination of age reference standards based on mandibular third molar root development in a Ugandan population aged 10–22 years

Tooth

Males

Females

  

Formation stages

No. of cases

Mean

SD

95% CI

Medians

No. of cases

Mean

SD

95% CI

Medians

§Mean difference

p-value

DGT

D

26

13.5

0.34

12.86–14.18

13.5

36

12.6

0.27

12.07–13.15

12.7

−0.9

0.041

E

97

15.7

0.21

15.29–16.09

15.7

107

14.7

0.19

14.33–15.08

14.7

−0.9

0.002

F

82

17.4

0.23

16.91–17.81

17.4

83

16.3

0.21

15.92–16.77

16.3

−1.0

0.002

G

67

19.0

0.20

18.63–19.40

19.0

58

18.8

0.23

18.32–19.24

18.8

−0.3

0.310

H

73

20.1

0.16

19.80–20.43

20.1

42

19.8

0.28

19.28–20.39

19.8

−0.9

0.355

Solari

D

26

13.5

0.34

12.86–14.22

13.5

36

12.6

0.27

12.07–13.15

12.7

−0.9

0.041

E

97

15.7

0.21

15.29–16.12

15.7

107

14.7

0.19

14.33–15.08

14.7

−1.0

0.001

F

39

17.0

0.28

16.48–17.57

17.0

40

15.7

0.27

15.21–16.27

15.7

−1.4

0.001

F1

43

17.6

0.36

16.88–18.32

17.6

43

16.9

0.29

16.33–17.50

16.9

−0.8

0.093

G

47

19.0

0.23

18.59–19.49

19.0

49

18.9

0.25

18.38–19.37

18.9

−0.2

0.461

G1

20

19.0

0.43

18.18–19.85

19.0

09

18.2

0.61

17.00–19.42

18.2

−0.5

0.365

H

73

20.1

0.17

19.76–20.43

20.1

42

19.8

0.28

19.29–20.42

19.8

−0.3

0.354

  1. Root stages D–H are the 5 stages of Demirjian’s classification, while the Solari’s classification has 7stages including two extra root stages: F1 and G1