Table 1 Baseline characteristics

Age in years, mean ± SD

47 ± 11

Female sex

138 (72%)

Arthralgia duration in months, median (IQR)

12 (9-36)

Number of reported painful joints, median (IQR)

2 (0-4)

Tender joint count (53 joints), median (IQR)

0 (0-1)

Antibody status

   ACPA negative, IgM-RF positive

60 (31%)

   ACPA positive, IgM-RF negative

71 (37%)

   ACPA positive, IgM-RF positive

61 (32%)