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Table 2 Descriptive breakdown of velocity of protraction for both groups and for each individual protraction site

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 protraction sites (N) Mean protraction distance (mm/month) SD Minimum Maximum Median
Herbst 22 0.51 0.19 0.17 0.89 0.51
TAD 14 0.35 0.15 0.17 0.63 0.33
All Groups 36 0.45 0.19 0.17 0.89 0.45