Table 1

Prevalence of joint involvement and RF after the initial episode

Clinical finding		Group^1-150		No of positive cases/no of total cases
Clinical finding		Group^1-150		Initial episode	4 months after	6 years after
Joint pain	B19 negative	52/52 (100)	4/52 (7.7)^**	2/52 (3.6)^**
Joint pain	B19 positive	12/12 (100)	4/12 (33.3)^**	4/12 (33.3)^**
Positive RF	B19 negative	3/52 (5.8)	3/52 (5.8)^**	3/52 (5.8)^**
Positive RF	B19 positive	1/12 (8.3)	5/12 (41.6)^**	4/12 (33.3)^**

↵1-150 Each group was divided into two groups based on the evidence of 1gM anti-B19 antibody at beginning of the study. ^**p<0.01.