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Table 1 Descriptive statistics and comparisons between groups at T1

From: Rapid palatal expansion effects on mandibular transverse dimensions in unilateral posterior crossbite patients: a three-dimensional digital imaging study

   Control group    RPE group   
   n = 15 (7 M; 8 F) n = 33 (15 M; 18 F)
Variable Unit N Mean sd N Mean sd
Age years 15 8.3 1.2 33 8.8 1.1
T1-T2 months 15 12 2.4 33 15 2.4
36–46 (occlusal) mm 15 46.9 2.4 33 47.1 2.9
36–46 (lingual) mm 15 33.7 1.7 33 33.5 2.4
33–43 mm 14 27.0 1.5 16 26.5 2.0
36 angulation ° 15 −44.7 6.8 33 −47.6 8.8
46 angulation ° 15 −44.7 10.7 33 −48.4 6.9
33 angulation ° 13 −13.7 6.8 20 −15.8 6.8
43 angulation ° 13 −16.3 8.9 20 −17.1 12.0
31 angulation ° 15 −8.1 4.8 25 −9.0 6.2
41 angulation ° 15 −7.7 5.4 25 −8.7 7.6
  1. All comparisons were not significant (p > 0.05, Student’s t test for independent samples)