Table 4. Spearman’s correlation coefficients between clinical parameters and treatment duration.

Correlations	r	P-value
Treatment duration with age	-0.041	0.814
Treatment duration with PlIPre	-0.156	0.370
Treatment duration with GIPre	-0.336	0.048
Treatment duration with PDPre	-0.247	0.153
Treatment duration with BLPre	-0.111	0.550
Bone level change with age	0.03	0.862
Bone level change with PlIPre	0.436	0.009
Bone level change with GIPre	0.391	0.020
Bone level change with Pdpre	0.389	0.038
Bone level change with BLPre	0.622	<0.001

r: Spearman's correlation coefficient, PlIPre: plaque index at baseline, GIPre: gingival index at baseline, PDPre: probing depth at baseline, BLPre: alveolar bone level at baseline.