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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