Skip to main content

Table 5 Clinical variables (mean ± standard deviation) of plaque index (PLI), gingival index (GI), and bleeding index (BI) at baseline (T0), 6 weeks after baseline (T1), and 12 weeks after baseline (T2)

From: The effect of (-)-epigallocatechin gallate as an adjunct to non-surgical periodontal treatment: a randomized clinical trial

  Mean ± standard deviation Between-group p value Intra-group p value
T0 T1 T2 Comparison of slopes T0 vs T1
T0 vs T2
PLI Test 1.63 ± 0.71 0.78 ± 0.68 0.82 ± 0.66 p =0.675 p <0.001*
p <0.001*
Control 1.57 ± 0.71 0.79 ± 0.62 0.82 ± 0.66 p <0.001*
p <0.001*
Between-group p value   p =0.232 p =0.761 p =0.964   
GI Test 2.56 ± 0.50 1.86 ± 0.53 1.68 ± 0.55 p =0.219 p <0.001*
p <0.001*
Control 2.58 ± 0.49 1.88 ± 0.49 1.76 ± 0.54 p <0.001*
p <0.001*
Between-group p value   p =0.559 p =0.568 p =0.539   
BI Test 3.41± 0.73 2.12 ± 0.82 1.85 ± 0.76 p =0.219 p <0.001*
p <0.001*
  Control 3.43± 0.74 2.10 ± 0.74 1.99 ± 0.80   p <0.001*
p <0.001*
Between-group p value   p =0.733 p =0.723 p =0.014*   
  1. Repeated measures analysis of variance test was used in the between-group comparison of slopes. Multivariate analysis of variance was used in between-group comparison at each time point. Paired-sample t test was used in the intra-group comparison
  2. *p <0.05