Table 2.

Prevalence of bacteria in subgingival biofilm samples

(total of positive results (samples with counts ≥10⁵) / total of analysed samples)

	RA	periodontitis	Controls	McNemar-Bowker test P
P. gingivalis	3 (1) / 10	10 (6) / 10	0 (0) / 10	0.018
T. forsythia	8 (6) / 10	10 (9) / 10	2 (1) / 10	n.s.
T. denticola	4 (2) / 10	9 (5) / 10	0 (0) / 10	0.026
P. intermedia	7 (1) / 10	9 (3) / 10	1 (0) / 10	n.s.
A. actinomycetemcomitans	5 (1) / 10	4 (3) / 10	1 (0) / 10	0.028

RA: rheumatoid arthritis; n.s.: not significant