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Table 1 Descriptive characteristics of patients affected by unwanted tooth movements (study group) and nonaffected patients (control group)

From: 3D-analysis of unwanted tooth movements despite bonded orthodontic retainers: a pilot study

  Study group (n = 44) Control group (n = 43) p-value
n % n %
Female 28 63.6 24 55.8 0.457
Male 16 36.4 19 44.2 0.457
Angle class I 22 50.0 21 48.8 0.914
Angle class II 20 45.5 17 39.5 0.577
Angle class III 2 4.5 5 11.7 0.225
Extractions 15 34.1 13 30.2 0.700
  Mean (yrs) SD Mean (yrs) SD  
Age at T0 12.68 2.11 14.36 5.60 0.136
Age at T1 15.44 2.20 16.97 5.61 0.327
Age at T2 17.32 2.74 19.13 5.58 0.231
Treatment duration 2.73 0.70 2.61 0.82 0.236
Retention phase 1.89 1.57 2.15 0.41 0.706
  1. n number, yrs years, SD standard deviation