Table 1 Demographic and clinical features of the patients in the two cohorts

Gender, % female

40

58

33

100

Age, years

47 (33-55)

62 (53-74)

38 (31-44)

48 (32-63)

Disease duration, years

3 (1-29)

3 (1-11)

2 (1-4)

2 (1-5)

Swollen-joint count

1 (1-2)

8 (5-15)

1 (0-1)

1 (0-2)

CRP, mg/L

12 (5-31)

19 (8-58)

2 (1-7)

5 (4-11)

ESR, mm/hour

29 (23-43)

47 (33-66)

2 (2-16)

21 (13-29)

% using DMARDs

80

54

50

100