Table 6.

Periodontitis parameters and salivary inflammatory markers in patients in different age groups.

	All patients			Sub-groups of specific patients
	Younger group	Older group	P value	Younger group with moderate-to-severe AS	Older group with normal-to-mild AS	P value
PI	1.71 ± 0.32	1.80 ± 0.32	0.076	1.94 ± 0.41	1.75 ± 0.24	0.065
PD	2.91 ± 0.68	3.05 ± 0.66	0.179	3.32 ± 0.52	3.09 ± 0.69	0.346
CI	1.71 ± 0.32	1.76 ± 0.36	0.416	1.94 ± 0.40	1.78 ± 0.26	0.139
CAL	3.38 ± 1.15	3.87 ± 1.19*	0.011	4.40 ± 0.81	3.76 ± 0.99	0.077
GI	2.21 ± 0.38	2.26 ± 0.43	0.398	2.57 ± 0.37	2.31 ± 0.30**	0.029
Number of teeth lost	4.93 ± 7.46	6.98 ± 7.39	0.083	8.80 ± 2.54	6.17 ± 1.23	0.35
IL-6 (pg/ml)	4.37 ± 0.55	4.99 ± 1.59	0.764	3.32 ± 0.70	2.93 ± 0.26	0.535
MMP-9 (ng/ml)	513.83 ± 52.35	554.58 ± 34.55	0.509	411.60 ± 127.90	569.05 ± 49.46	0.256
TNF-α (pg/ml)	35.50 ± 10.15	43.09 ± 26.29	0.746	3.57 ± 2.07	58.51 ± 22.97	0.64

Continuous variables are expressed in the form mean ± SD.

*p < 0.05 vs. younger group.

**p<0.05 vs. younger group with moderate-to-severe AS.