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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