Table 1

Characteristics of patients with ExRA and RA controls

ExRARA controlsp Value
N3570
Sex (Male/Female)15/2030/40
Age (Years; Mean (SD))65.5 (11.9)65.5 (11.6)
Duration (Years; Median (IQR))9.6 (2.3–19.4)8.6 (3.4–18.2)
Swollen joints (Mean (SD))6.5 (5.7)3.0 (3.4)0.002
CRP* (mg/l; Median (IQR)39.5 (11.5–54.5)<9 (<9–15)<0.0001
Anti-CCP positive (>50 U/ml)27/35 (77%)39/70 (56%)0.03
Anti-MCV positive (>20 U/ml)34/35 (97%)46/67 (69%)0.001
RF positive (>20 IU/ml)33/35 (94%)49/69 (71%)0.006
  • *Data available for 32 cases and 68 controls.

  • CCP, cyclic citrullinated peptides; CRP, C reactive protein; ExRA, extra-articular rheumatoid arthritis; MCV, modified citrullinated vimentin; RF, rheumatoid factor.