Table 5.

Frequency distribution of sites with residual PD (N/%) with and without BOP positive after 6-month follow-up

	0–4 mm	5 mm	6 mm	7 mm	≥ 8 mm
Residual PD with BOP negative (N/%)
Test group	665/74.3	86/9.6	44/4.9	0/0	0/0
Control group	496/68.1	91/12.5	28/3.8	8/1.0	8/1.0
Significance (p)	0.001*
Residual PD with BOP positive (N/%)
Test group	80/8.9	20/2.2	0/0	0/0	0/0
Control group	44/6.0	30/4.1	2/0.3	1/0.1	20/2.7
Significance (p)	0.001*

PD, probing depth; BOP, bleeding on probing; N, number of sites

*Based on the Mantel-Haenszel χ² test