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Table 4 Descriptive statistics for the discriminating variables

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

  Treatment N Mean SD p valuea
Lower crowding Non-extraction 397 -1.98 3.17 0.000
Extraction 145 -6.63 3.60
LL-E-plane Non-extraction 397 -1.72 3.12 0.000
Extraction 145 -0.22 2.90
Upper crowding Non-extraction 397 -1.16 3.78 0.000
Extraction 145 -5.00 3.79
Overjet Non-extraction 397 2.85 1.94 0.004
Extraction 145 3.45 2.21
  1. at test for independent samples. LL, lower lip.