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Table 2 Comparison at 3-month and 6-month intervals

From: A prospective randomized clinical trial into the capacity of a toothpaste containing NovaMin to prevent white spot lesions and gingivitis during orthodontic treatment

  Decalcification index (DI)
  Number Mean Median St dev Min Max P value (t-test)
Baseline ReNew 24 0.33 0.21 0.34 0 1.17  
Baseline crest 24 0.330 0.250 0.4 0 1.33 0.97
3 month ReNew 24 0.48 0.33 0.44 0 1.42  
3 month crest 23 0.24 0.17 0.3 0 1.250 0.0403*
6 month ReNew 23 0.47 0.42 0.37 0 1.58  
6 month crest 21 0.440 0.250 0.470 0 2.08 0.81
Plaque index (PI)
Baseline ReNew 24 3.04 3.250 1.33 0 4.92  
Baseline crest 26 3.39 3.63 0.93 1.58 5 0.27
3 month ReNew 24 3.22 3.42 1.16 1.17 5  
3 month crest 23 3.48 3.33 0.9 1.750 4.83 0.41
6 month ReNew 23 3.53 3.42 1.09 1.92 5  
6 month crest 21 3.86 4.09 1.07 1 5 0.32
Gingival index (GI)
Baseline ReNew 24 2.14 2.13 0.61 1.42 3.83  
Baseline crest 24 2.15 2.250 0.47 1.250 3 0.95
3 month ReNew 24 2.15 2.04 0.52 1.17 3  
3 month crest 22 2.35 2.250 0.43 1.67 3.17 0.17
6 month ReNew 23 2.42 2.33 0.560 1.33 3.42  
6 month crest 21 2.5 2.42 0.63 1.33 4 0.69
  1. P value was set at 0.05 using two-sample t-test
  2. *P < 0.05 indicating a significant difference between groups for DI at 3 months