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Table 3 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≥ 4mm 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

5.30 ± 1.27

4.04 ± 1.35

3.57 ± 1.30

p =0.680

p <0.001*

p <0.001*

Control

5.19 ± 1.23

4.02 ± 1.21

3.57 ± 1.08

p <0.001*

p <0.001*

Comparison

2 groups at time point

 

p =0.181

p =0.888

p =0.960

  

CAL (mm)

Test

5.45 ± 2.02

4.41 ± 1.86

3.71 ± 2.01

p =0.918

p <0.001*

p <0.001*

Control

5.35 ± 1.89

4.45 ± 1.72

3.77 ± 1.87

p <0.001*

p <0.001*

Comparison

2 groups at time point

 

p =0.448

p =0.798

p =0.672

  
  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