Table 1.

Demographic and clinical parameters of the two study cohorts.

	RA Patients	Blood Donors
Number	196	101
Age ± SD	64(13)	49(14)
Men	40 (20%)	47 (47%)
Smoking	101 (52%)	36 (36%)
Oral health problems *	96 (50%)	23 (23%)
Oral treatment §	53 (33%)	18 (18%)

* Self-reported experienced gum problem. ^§ Having been subject to treatment of periodontal gum problem.