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Table 2 Intergroup comparison of the studied variables (t test)

From: Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions

Variable Group 1 (3 premolar extractions) n = 24 Group 2 (4 premolar extractions) n = 28  
Mean SD Mean SD p
AGE1 13.54 2.36 13.33 1.34 0.68
AGE2 17.03 2.65 16.31 1.61 0.23
AGE3 23.45 3.58 23.70 4.17 0.82
Treatment time 3.48 1.15 2.98 1.24 0.14
Long-term posttreatment time 6.43 2.81 7.40 4.37 0.36
PAR1 20.46 8.64 18.11 7.88 0.31
PAR2 2.54 1.56 3.18 1.63 0.16
PAR3 4.04 2.12 3.86 2.10 0.75
PAR treatment changes 17.92 8.27 14.93 7.59 0.18
PAR long-term posttreatment changes 1.50 2.77 0.68 2.18 0.24
Percentage of PAR treatment changes (%) 86.04 8.46 80.94 10.66 0.07
Percentage of PAR long-term posttreatment changes (%) 9.37 16.90 4.98 16.08 0.34
  1. AGE 1, PAR1: age and PAR index value at T1 - pretreatment; AGE 2, PAR2: age and PAR index value at T2 - posttreatment; AGE 3, PAR3: age and PAR index value at T3 - long-term posttreatment.