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Table 2 Paired sample t -test comparing pre-treatment (T1) and post-functional (T2) values

From: Cephalometric study to test the reliability of anteroposterior skeletal discrepancy indicators using the twin block appliance

 

Mean

N

Standard deviation

Standard error of the mean

Mean difference

p value

ANB angle (T1)

7.36

25

1.469

0.294

−3.84

<0.0001*

ANB angle (T2)

3.52

25

1.388

0.278

Wits appraisal (T1)

6.72

25

2.092

0.418

−5.46

<0.0001*

Wits appraisal (T2)

1.26

25

1.849

0.37

β angle (T1)

19.12

25

3.153

0.631

8.56

<0.0001*

β angle (T2)

27.68

25

3.024

0.605

APDI (T1)

70.2

25

3.64

0.728

7.76

<0.0001*

APDI (T2)

77.96

25

3.702

0.74

App-Bpp (T1)

12.52

25

2.801

0.56

−4.72

<0.0001*

App-Bpp (T2)

7.8

25

2.179

0.436

YEN angle (T1)

114.12

25

4.799

0.96

4.8

<0.0001*

YEN angle (T2)

118.92

25

5.227

1.045

W angle (T1)

49.52

25

3.38

0.676

4.2

<0.0001*

W angle (T2)

53.72

25

3.361

0.672

  1. T1, pre-treatment; T2, post-functional; *p ≤ 0.05 = significant.