Table 2 Shows the results of the hierarchical clustering analysis for skeletal class I and II patients together. Cephalometric parameters and age, descriptive statistics (mean, and standard deviation (SD)) for each cluster. Besides, the table presents the significance levels between the two clusters using t test analysis (NS—not significant, * < 0.05, and ** < 0.01)

Age

12.90

3.87

13.15

6.31

NS

NL-ML angle [°]

21.44

5.05

25.96

5.87

**

NL-NSL angle [°]

6.35

3.05

9.40

3.39

**

PFH/AFH (%)

69.86

4.10

63.33

4.00

**

Gonial angle [°]

119.39

5.94

123.90

6.19

**

Facial axis

91.24

3.92

87.89

4.32

**

SNA angle [°]

83.21

2.91

78.94

2.90

**

SNB angle [°]

78.56

2.79

74.24

2.46

**

ANB angle [°]

4.66

1.80

4.71

2.33

NS

ANB_ind [°]

3.68

1.34

3.49

1.48

NS

Calculated_ANB (ANB – ANB_ind) [°]

0.97

1.64

1.20

1.65

NS

SN-Ba angle [°]

130.19

4.41

134.47

4.21

**

SN-Pg angle [°]

79.66

2.69

75.12

2.54

**

S–N (mm)

75.00

71.28

66.31

4.38

NS

Go-Me (mm)

74.94

67.54

65.24

5.33

*

Wits appraisal (mm)

2.00

3.96

0.71

4.89

**

ML-NSL angle [°]

27.79

4.69

35.38

4.90

**

 + 1/NL angle [°]

68.05

10.46

70.75

6.79

**

 + 1/SNL angle [°]

74.40

10.53

80.15

7.15

**

 + 1/NA angle [°]

22.38

10.60

20.90

7.09

NS

 + 1/NA (mm)

3.71

5.44

2.73

2.51

**

−1/ML (anatomic)

81.22

6.57

83.90

7.50

**

−1/NB angle [°]

25.12

6.99

25.72

7.30

NS

−1/NB (mm)

4.44

6.13

4.27

2.58

NS

Interincisal angle [°]

127.84

13.84

128.67

11.27

NS