Table 1 Descriptive statistics and comparisons between groups at T1

Age

years

15

8.3

1.2

33

8.8

1.1

T1-T2

months

15

12

2.4

33

15

2.4

36–46 (occlusal)

mm

15

46.9

2.4

33

47.1

2.9

36–46 (lingual)

mm

15

33.7

1.7

33

33.5

2.4

33–43

mm

14

27.0

1.5

16

26.5

2.0

36 angulation

°

15

−44.7

6.8

33

−47.6

8.8

46 angulation

°

15

−44.7

10.7

33

−48.4

6.9

33 angulation

°

13

−13.7

6.8

20

−15.8

6.8

43 angulation

°

13

−16.3

8.9

20

−17.1

12.0

31 angulation

°

15

−8.1

4.8

25

−9.0

6.2

41 angulation

°

15

−7.7

5.4

25

−8.7

7.6