Table 2.

Probing depth (PD), clinical attachment level (CAL), bone sounding (BS) before and during subsequent follow-up assessments

Parameter	[mm]	Time of observation [months]		Difference between baseline and 12 months post-op	p-value (Friedman ANOVA)	Mean diff. (95% Cl) between baseline and 12 months post-op
PD	x ± SD	Baseline	2.74 ± 0.57	− 0.26 mm	p < 0.001	0.07 (− 0.33, − 0.18)
		3	2.54 ± 0.64
		6	2.58 ± 0.55
		9	2.62 ± 0.57
		12	2.48 ± 0.51
CAL	x ± SD	Baseline	2.75 ± 0.57	−0.26 mm	p < 0.001	0.07 (− 0.33, − 0.19)
		3	2.55 ± 0.64
		6	2.59 ± 0.55
		9	2.61 ± 0.58
		12	2.49 ± 0.51
BS	x ± SD	Baseline	4.76 ± 0.94	−0.27 mm	p < 0.001	0.13 (−0.41, − 0.14)
		3	4.65 ± 0.84
		6	4.82 ± 0.82
		9	4.65 ± 0.88
		12	4.49 ± 0.77

x ± SD mean values and standard deviation

Mean diff. mean difference

Cl Coinfidence interval