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Table 1 Intergroup comparability (chi-square and t tests)

From: External root resorption with the self-ligating Damon system—a retrospective study

  Male Female Total
Damon 13 12 25
Conventional 15 12 27
Total 28 24 52
  X2 = 0.06 DF = 1 P = 0.797a
  Group 1—Damon n = 25 Group 2—conventional n = 27  
  Mean SD Mean SD P
Initial age 16.04 5.20 16.77 5.32 0.623b
Final age 18.06 5.51 18.47 5.43 0.788b
T. time 2.02 0.68 1.70 0.56 0.078b
MxII. 6.60 3.68 5.13 1.66 0.065b
MdII. 6.36 2.93 5.40 1.60 0.144b
  1. MxII. maxillary irregularity index, MdII. mandibular irregularity index
  2. aChi-square test
  3. b t test