Table 1

 Basic characteristics of patients with RA and of healthy controls.

Data are mean (SEM) or mean (range)*.
NSAIDs, non-steroidal anti-inflammatory drugs; DMARDs, disease modifying drugs.
Number of subjects1514
Age (years)41.2 (1.5)44 (2.8)
Body mass index (kg/m2)21.6 (1.1)23 (1.1)
Disease duration (years)8.2 (2.4)
Number of affected joints5.1 (2–10)*
Morning stiffness (min)36 (0–120)*
Radiographic changes (Steinbrocker’s criteria)2.3 (1–3)*
Erythrocyte sedimentation rate (mm/1st h)20.3 (12)
C reactive protein (mg/l)15.4 (13)
Rheumatoid factor (IU)936 (16–5120)*
Number of patients using NSAIDs15
Number of patients using methotrexate10
Number of patients using DMARDs12