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Progress in Orthodontics

Table 2 Comparisons of intra- and intergroup differences between the two treatment groups

From: Vertical skeletal changes after extraction and non-extraction treatment in matched class I patients identified by a discriminant analysis: cephalometric appraisal and Procrustes superimposition

 

Extraction

 

Non-extraction

    

Variables

Diff.a

95%CI

P value

Diff.a

95%CI

P value

Adjusted diff.b

95%CI

P value

Overall P valuec

FMA (°)

− 0.68

(− 1.56, 0.21)

0.13

0.37

(− 0.50, 1.25)

0.40

− 0.98 (− 2.20, 0.23)

0.11

0.04

N-ANS/N-Me

− 0.38

(− 0.83, 0.07)

0.10

− 0.52

(− 0.97, − 0.08)

0.02

0.16 (− 0.46, 0.78)

0.61

 

SN to Go-Gn (°)

− 0.57

(− 1.19, 0.05)

0.07

0.32

(− 0.30, 0.93)

0.30

− 0.91 (− 1.77, − 0.06)

0.04

 

Y-axis (°)

− 0.39

(− 1.18, 0.40)

0.33

0.70

(− 0.07, 1.48)

0.08

− 1.11 (− 2.19, − 0.03)

0.04

 

Gonial angle (Ar-Go-Me) (°)

− 1.06

(− 1.80, − 0.32)

0.01

− 0.54

(− 1.27, 0.19)

0.15

− 0.52 (− 1.54, 0.49)

0.32

 

Palatal plane to SN (°)

0.38

(− 0.33, 1.09)

0.29

0.45

(− 0.25, 1.15)

0.21

− 0.15 (− 1.12, 0.81)

0.76

 

Palatal plane to MP (°)

− 0.70

(− 1.49, 0.08)

0.08

− 0.06

(− 0.84, 0.71)

0.87

− 0.60 (− 1.67, 0.47)

0.27

 
  1. P value evaluating the significance of all differences in the extraction group < 0.01; corresponding P value for the non-extraction group < 0.01
  2. aDifferences between post- and pretreatment measurements
  3. bAdjusted for age and sex differences between the two groups
  4. cTests whether all differences between treatment groups equal zero by using an F test
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