Table 2

Parameter	Time	N	Mean	SD	Mean difference	P-value
PPD	Baseline	30	6.43	0.79	2.64	< 0.001^a
PPD	9 months	30	3.78	0.77	2.64	< 0.001^a
CAL	Baseline	30	7.25	0.73	2.64	< 0.001^a
CAL	9 months	30	4.61	0.88	2.64	< 0.001^a
RAL	Baseline	30	10.35	0.78	2.93	< 0.001^a
RAL	9 months	30	7.42	0.85	2.93	< 0.001^a
VD	Baseline	30	7.46	0.81	2.56	< 0.001^a
VD	9 months	30	4.9	0.85	2.56	< 0.001^a
Width	Baseline	30	8.86	1.29	0.09	0.39
Width	9 months	30	8.77	1.15	0.09	0.39
ACH	Baseline	30	6.2	0.68	0.3	< 0.001^a
ACH	9 months	30	5.9	0.7	0.3	< 0.001^a
AD	Baseline	30	17.8	1.0	3.3	< 0.001^a
AD	9 months	30	14.5	1.01	3.3	< 0.001^a

^aStatistically significant at P < 0.001 (Student's paired t-test).
PPD = probing pocket depth; CAL = clinical attachment loss; RAL = relative attachment level; N = number of sites; SD = standard deviation, VD = vertical depth; ACH = alveolar crest height; AD = area of the defect.