Table 1

Baseline characteristics of the study population (n=736)

Female (n (%))564 (76.63)
Age (years, mean (SD))48.34 (12.32)
Caucasian (n (%))683 (92.80)
Symptom duration at first visit (months, mean (SD))3.36 (1.73)
IgM RF positive (n (%))341 (46.33)
Anti-CCP positive (n (%))290 (39.40)
ESR (mm/h, mean (SD))29.45 (24.67)
CRP (mg/l, mean (SD))21.90 (31.99)
DAS28 (mean (SD))5.11 (1.31)
HAQ (mean (SD))0.97 (0.68)
mTSS (mean (SD))5.76 (7.70)
Modified Sharp erosion score (mean (SD))2.76 (4.68)
Modified Sharp joint space narrowing score (mean (SD))3.00 (4.42)
HLA-DRB1*01 or 04 gene (n (%))401 (57.53)
RA 1987 ACR criteria (n (%))531 (72.15)
  • ACR, American College of Rheumatology; anti-CCP, anti-cyclic citrullinated peptide; CRP, C-reactive protein; DAS28, disease activity score in 28 joints; ESR, erythrocyte sedimentation rate; HAQ, health assessment questionnaire; HLA, human leucocyte antigen; mTSS, modified total Sharp score; RA, rheumatoid arthritis; RF, rheumatoid factor.