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Table 6 Treatment data (patient level)

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

  SL Non-SL Total
(n = 139) (n = 74) (N = 213)
  n (%) Mean ± SD n (%) Mean ± SD n (%) Mean ± SD
Treatment time (months)   20.7 ± 4.9   18.1 ± 5.3   19.8 ± 5.2
Number of visits   13.9 ± 3.3   12.4 ± 3.4   13.4 ± 3.4
Number of extraction cases (patients) 9 (6.5)   6 (8.1)   15 (7.0)  
  1. SL: self-ligating, SD: standard deviation.