Table 1.

Clinical features of healthy volunteers and periodontitis patients. The difference between healthy volenteerns and periodontitis patients was evaluated by student’s t-test

Clinical parameters	Healthy volunteers	Periodontitis patients	P value
Age	50.13 ± 6.70	48.27 ± 6.99	0.378
Gender (F/M)	28/24	37/33	0.828
probing pocket depth (mm)	1.62 ± 0.27	5.59 ± 0.74	< 0.001
Attachment loos (mm)	0.86 ± 0.11	4.99 ± 0.53	< 0.001
Plaque index	0.96 ± 0.68	2.40 ± 0.75	0.004
Bleeding index	0.50 ± 0.41	3.43 ± 1.40	< 0.001
MMP-8 (ng/mL)	13.33 ± 0.36	23.50 ± 1.13	< 0.001
Smoking status (N/Y)	28/24	25/45	0.032

The specifc signfiicance was not avaliable when the value of P < 0.001