Table 4 Measurements’ differences of the maximum dimension of IAC (MD), vertical distance (VD), and horizontal position (HP) relationship in different age groups

A

Group I

mean (± SD)

Group II

mean (± SD)

Group III

mean (± SD)

Group IV

mean (± SD)

p-value

Maximum dimension (MD)

 P1

-

-

2.60 ± 0.68

3.24 ± 1.29

^†0.520

 P2

3.07 ± 1.09

3.56 ± 0.70

3.23 ± 0.68

3.42 ± 0.87

^†0.538

 M1

3.39 ± 0.72

3.52 ± 0.66

3.36 ± 0.65

3.63 ± 1.23

^‡0.631

 M2

4.07 ± 0.93

3.76 ± 0.76

3.49 ± 0.72

3.98 ± 1.30

^‡0.056

 M3

4.76 ± 1.06

4.32 ± 1.09

4.11 ± 1.03

4.66 ± 1.41

^‡0.067

Vertical distance (VD)

P1

-

-

9.66 ± 2.72

8.95 ± 1.65

^†0.782

P2

10.28 ± 0.83^a

9.13 ± 1.58^a

7.90 ± 1.81^a

8.42 ± 1.54^a

^†0.041^**

M1

8.54 ± 1.53

8.34 ± 1.92

7.58 ± 1.97

7.46 ± 1.70

^⊺0.079

M2

8.73 ± 1.69^ab

8.88 ± 1.68^a

7.34 ± 2.02^b

7.85 ± 1.69^ab

^⊺0.0001^**

M3

10.36 ± 1.71^a

10.15 ± 2.34^a

8.51 ± 2.40^b

9.46 ± 2.70^ab

^⊺0.003^**

B

Group I

%(count)

Group II

%(count)

Group III

%(count)

Group IV

%(count)

p-value

P1

^§1.000

M

0.0 (0)

0.0 (0)

50.0 (1)

33.3 (1)

B

0.0 (0)

0.0 (0)

0.0 (0)

0.0 (0)

L

0.0 (0)

0.0 (0)

50.0 (1)

66.7 (2)

P2

^§1.000

M

66.7 (2)

66.7 (6)

71.4 (25)

68.7 (22)

B

0.0 (0)

0.0 (0)

0.0 (0)

0.0 (0)

L

33.3 (1)

33.3 (3)

28.6 (10)

31.3 (10)

M1

^§0.004^**

M

54.5 (6)

19.2 (5)

49.2 (32)

30.5 (25)

B

9.1 (1)

0.0 (0)

1.6 (1)

0.0 (0)

L

36.4 (4)

80.8 (21)

49.2 (32)

69.5 (57)

M2

^§0.056

M

18.2 (2)

19.2 (5)

21.5 (14)

10.3 (9)

B

9.1 (1)

0.0 (0)

0.0 (0)

0.0 (0)

L

72.7 (8)

80.8 (21)

78.5 (51)

89.7 (78)

M3

^§0.197

M

33.3 (4)

19.2 (5)

39.4 (26)

23.3 (21)

B

0.0 (0)

0.0 (0)

0.0 (0)

2.2 (2)

L

66.7 (8)

80.8 (21)

60.6 (40)

74.5 (67)