Table 1

Patient characteristics for each patient set

UA (n=231)All patients (n=513)
Women (%)6873
Age, years (mean, SD)53 (14)50 (14)
SJC (median, range)4 (1–38)0 (0–38)
TJC (median, range)7 (0–42)6 (0–42) mv=2
RF positive (%)35%26%
Anti-CCP positive (%)28% mv=619% mv=10
ESR, mm/h (median, range)18 (1–103) mv=714 (0–103) mv=15
CRP, mg/l (median, range)6 (1–180) mv=165 (1–180) mv=40
Erosions (%)9% mv=44% mv=9
RA, according to 1987 ACR criteria29% mv=314% mv=5
RA, according to 2010 ACR/EULAR criteria45% mv=1258% mv=6
Persistent arthritis at 1 year45% mv=971% mv=3
  • ACR, American College of Rheumatology; CCP, cyclic citrullinated protein; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; EULAR, European League Against Rheumatism; mv, missing values; RA, rheumatoid arthritis; RF, rheumatoid factor; SJC, swollen joint count; TJC, tender joint count; UA, undifferentiated arthritis.