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Table 1 Age distribution for the control, tooth-borne, and bone-anchored protraction facemask groups

From: Comparison of two maxillary protraction protocols: tooth-borne versus bone-anchored protraction facemask treatment

  Control Tooth-borne protraction facemask Bone-anchored protraction facemask
  t0 t1 Diff t1 t2 Diff T1 T2 Diff
Mean 9.0 9.8 0.8 9.7 10.5 0.8 9.8 10.4 0.6
SD 1.8 1.6 1.6 1.6 1.6 1.6 1.2 1.2 1.2
Min 6.1 6.9   6.90 7.11   8.0 9.0  
Max 12.7 13.2   13.2 14.1   12.0 13.0