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Table 1 Descriptive analysis of subjects’ ages at the time of initiating protraction (T1, years), and sex

From: Comparison of anchorage reinforcement with temporary anchorage devices or a Herbst appliance during lingual orthodontic protraction of mandibular molars without maxillary counterbalance extraction

  Valid N Mean age (Y) SD Minimum Maximum Median
Females 15 16.74 2.19 13.417 20.99 16.34
Males 12 16.29 1.28 14.845 19.73 16.14
All Groups 27 16.54 1.82 13.417 20.99 16.14
Herbst 15 16.43 1.63 14.798 20.57 16.14
TAD 12 16.68 2.11 13.417 20.99 16.39
All Groups 27 16.54 1.82 13.417 20.99 16.14
  1. No significant difference in subjects’ age distribution was found between male and female subjects (unpaired t-test, p = 0.51) or between the Herbst or TAD group (unpaired t-test, p = 0.74). Also, no significant difference in subjects’ sex distribution was found between the Herbst and TAD groups (Fisher’s exact test, p = 0.7)