Significance of Circulating and Crevicular Matrix Metalloproteinase-9 in Rheumatoid Arthritis-Chronic Periodontitis Association

Table 2

MMP-9 levels of crevicular and serum concentrations in RA, RA-CP, CP, and healthy groups and statistical significance comparison between groups.

Parameter; (mean ± SD)	Control; group; ()	RA group ()	CP group; ()	RA-CP; group; ()
Serum MMP-9 (ng/mL)	34.12 ± 15.4	498.12 ± 143.72; P < 0.001^*	54.81 ± 25.93; P < 0.01^**	640.18 ± 247.76; P < 0.001^***; P < 0.001^#; P > 0.05^##
GCF; MMP-9 (ng/mL)	25.06 ± 11.9	44.16 ± 18.96; P < 0.001^*	42.31 ± 19.92; P < 0.01^**	58.67 ± 14.23; P < 0.001^***; P < 0.05; P < 0.05

Significant statistical differences between RA and control group for serum and GCF MMP-9.
^**Significant statistical differences between CP and control group for serum and GCF MMP-9.
^***Significant statistical differences between RA-CP and control group for serum and GCF MMP-9.
^#Significant statistical differences between RA-CP and CP group for serum MMP-9.
Significant statistical differences between RA-CP and CP group for GCF MMP-9.
Significant statistical differences between RA-CP and RA group for GCF MMP-9.
 ^##No significant statistical differences between RA-CP and RA group for serum MMP-9.