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Table 1 Patient data

From: Root resorption, treatment time and extraction rate during orthodontic treatment with self-ligating and conventional brackets

  SL (n = 139) Non-SL (n = 74) Total (N = 213)
  n (%) Mean ± SD n (%) Mean ± SD n (%) Mean ± SD
Amount of teeth 1112   592   1704  
Gender       
  Male 56 (40.3)   23 (31.1)   79 (37.1)  
  Female 83 (59.7)   51 (68.9)   134 (62.9)  
Age at start of treatment (years)   12.6 ± 2.3   12.1 ± 2.2   12.1 ± 2.2
  1. SL: self-ligating, SD: standard deviation.