Table 4.

Comparison of changes of clinical periodontal status between experimental and control groups

	Changes in experiment group (N = 66)	Changes in control group (N = 60)	P*
% of sites with BOP
Mean ± S.D	−23.0 ± 25.3	−12.3 ± 21.5	0.004#
% of sites with PD
1–3 mm	18.9 ± 12.9	6.0 ± 10.9	< 0.001**
4–6 mm	−16.0 ± 10.6	−4.7 ± 10.0	< 0.001**
≥ 7 mm	−3.0 ± 6.7	−1.3 ± 4.6	0.008#
PD (sites with initial PD 1–3 mm)
Mean ± S.D (mm)	−0.05 ± 0.4	0.2 ± 0.4	< 0.001
PD (sites with initial PD 4–6 mm)
Mean ± S.D (mm)	−1.1 ± 0.5	−0.5 ± 0.5	< 0.001
PD (sites with initial PD ≥ 7 mm)***
Mean ± S.D (mm)	−2.2 ± 1.2	−1.7 ± 1.4	0.009#
% of sites with CAL
1–2 mm	8.6 ± 9.4	0.6 ± 10.3	< 0.001
3–4 mm	2.3 ± 10.6	0.8 ± 11.1	0.44**
≥5mm	−10.9 ± 10.4	−1.5 ± 9.7	< 0.001
CAL (sites with initial PD 1–3 mm)
Mean ± S.D (mm)	0.02 ± 0.2	0.1 ± 0.2	< 0.001
CAL (sites with initial PD 4–6 mm)
Mean ± S.D (mm)	−0.5 ± 0.2	−0.2 ± 0.3	< 0.001**
CAL (sites with initial PD ≥ 7mm)***
Mean ± S.D (mm)	−0.9 ± 0.6	−0.8 ± 0.9	0.14
REC (sites with initial PD 1–3 mm)
Mean ± S.D (mm)	−0.1 ± 0.3	−0.04 ± 0.2	0.60
REC (sites with initial PD 4–6 mm)
Mean ± S.D (mm)	−0.2 ± 0.3	−0.1 ± 0.3	0.16**
REC (sites with initial PD ≥ 7mm) ***
Mean ± S.D (mm)	−0.4 ± 0.7	−0.2 ± 0.8	0.24

Change of clinical periodontal status = re-evaluation – initial

^*Wilcoxon-Mann-Whitney test

^**Student t-test

^***experimental group (n=48), control group (n=42)

^#p values were > 0.05 after adjustment for multiple comparisons using Bonferroni’s correction