Table 2.

Response of periodontal parameters to non-surgical periodontal treatment compared between the healthy control and RA group.

		Control group	RA group	P
N		32	32
PI	Pre	1.7 ± 0.6	1.9 ± 0.7	0.471
	Post	0.8 ± 0.4	1.1 ± 0.6	0.042
	Δ	-0.9 ± 0.7	-0.8 ± 0.7	0.354
GI	Pre	1.7 ± 0.5	1.6 ± 0.6	0.575
	Post	0.6 ± 0.4	0.7 ± 0.5	0.619
	Δ	-1.0 ± 0.7	-0.9 ± 0.6	0.400
PD	Pre	3.2 ± 0.4	3.0 ± 0.5	0.079
	Post	2.7 ± 0.3	2.2 ± 0.4	0.001 ∗
	Δ	-0.6 ± 0.4	-0.8 ± 0.4	0.006 ∗
CAL	Pre	4.0 ± 0.5	4.0 ± 0.6	0.907
	Post	3.3 ± 0.4	2.9 ± 0.6	0.003 ∗
	Δ	-0.7 ± 0.5	-1.1 ± 0.5	0.003 ∗
BOP	Pre	82.8 ± 24.1	78.4 ± 24.1	0.476
	Post	40.8 ± 25.8	39.4 ± 21.8	0.817
	Δ	-41.9 ± 35.7	-39.0 ± 26.5	0.711

Values are expressed as mean ± SD.

Δ is net change after nonsurgical periodontal treatment, calculated by Post-Pre.

BOP, bleeding on probing; CAL, clinical attachment level; GI, gingival index; PD, probing depth; PI, plaque index; RA, rheumatoid arthritis.

^∗ Independent t-test, P < 0.05.