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Progress in Orthodontics

Table 3 Descriptive statistics

From: Extraction decision and identification of treatment predictors in Class I malocclusions

  

Non-extraction

Extraction

p valuea

Cephalometric variables

SNA

Mean

81.76

81.26

0.184

SD

3.93

3.79

SNB

Mean

78.54

77.11

0.000

SD

3.65

3.54

ANB

Mean

3.16

4.08

0.000

SD

2.27

2.21

U1-SN

Mean

104.12

103.23

0.215

SD

7.26

7.71

U1-NA (1)

Mean

22.15

21.72

0.535

SD

7.00

7.62

NSGn

Mean

67.13

68.88

0.000

SD

4.09

3.71

FMIA

Mean

61.95

60.32

0.022

SD

7.55

6.71

IMPA

Mean

92.38

92.58

0.763

SD

5.99

5.51

FMA

Mean

25.60

27.05

0.011

SD

397

145

L1-NB (1)

Mean

24.99

25.72

0.258

SD

6.59

6.66

U1-L1

Mean

129.48

128.30

0.257

SD

10.51

11.26

SN-PP

Mean

7.09

7.25

0.631

SD

3.52

3.11

SN-OP

Mean

16.27

17.72

0.001

SD

4.58

4.63

Z angle

Mean

75.05

71.79

0.000

SD

7.04

6.39

PNS-A

Mean

48.97

49.01

0.939

SD

4.48

5.26

U1-NA (2)

Mean

3.97

4.18

0.479

SD

2.56

3.12

L1-NB (2)

Mean

4.34

5.18

0.000

SD

2.39

2.59

L1-A Pg

Mean

1.92

2.38

0.056

SD

2.44

2.63

Pg-NB

Mean

1.43

0.94

0.007

SD

1.89

1.66

WITS

Mean

-0.15

0.58

0.023

SD

2.82

3.41

N-Me

Mean

114.67

116.74

0.073

SD

10.15

12.41

N-ANS

Mean

51.03

51.48

0.380

SD

5.12

5.74

ANS-Me

Mean

65.84

67.46

0.030

SD

6.39

8.03

LL-E-plane

Mean

-1.72

-0.22

0.000

SD

3.12

2.90

S-Go

Mean

72.93

72.31

0.449

SD

8.08

9.54

S-Ar

Mean

33.98

33.54

0.297

SD

4.36

4.41

Model variables

Overbite

Mean

3.14

3.53

0.033

SD

1.93

1.71

Overjet

Mean

2.85

3.45

0.004

SD

1.94

2.21

Upper crowding

Mean

-1.16

-5.00

0.000

SD

3.79

3.79

Lower crowding

Mean

-1.98

-6.63

0.000

SD

3.17

3.60

Upper midline deviation

Mean

0.06

0.32

0.034

SD

1.00

1.32

Lower midline

Mean

0.00

-0.09

0.573

SD

1.19

1.60

Demographic variables

Age

Mean

14.55

14.52

0.948

SD

5.36

4.86

  1. at test for independent samples.
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