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Table 4 Clinical variables (mean ± standard deviation) of probing pocket depth (PPD) and clinical attachment level (CAL) at baseline (T0), 6 weeks after baseline (T1), and 12 weeks after baseline (T2) (sites of PPD≥ 6mm at baseline)

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
PPD (mm) Test 6.85 ± 0.91 5.04 ± 1.55 4.38 ± 1.58 p =0.658 p <0.001*
p <0.001*
Control 6.83 ± 0.79 5.02 ± 1.33 4.28 ± 1.29 p <0.001*
p <0.001*
Comparison
2 groups at time point
  p =0.910 p =0.887 p =0.563   
CAL (mm) Test 7.13 ± 1.89 5.59 ± 1.98 4.81 ± 2.11 p =0.806 p <0.001*
p <0.001*
Control 7.12 ± 1.47 5.69 ± 1.66 4.79 ± 1.71 p <0.001*
p <0.001*
Comparison
2 groups at time point
  p =0.934 p =0.973 p =0.914   
  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