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Table 2 Mean irregularity index (mm) in the two groups before and after treatment

From: Tooth alignment and pain experience with A-NiTi versus Cu-NiTi: a randomized clinical trial

Time Study group irregularity index P value* Test statistic
A-NiTi mean (SD) Cu-NiTi mean (SD)
Before treatment 8.73 (2.22) 8.34 (2.15) 0.395 0.855
After treatment 6.17 (1.82) 5.47 (1.69) 0.065 1.87
P value** < 0.001 < 0.001   
Test statistic 13.17 13.78   
Change in irregularity index (mm) 2.56 2.87   
  1. **Paired t test, *Independent samples t test
  2. SD standard deviation