Table 2

 Patient characteristics at baseline of the RA-RA group, the UA-RA group, and patients with UA who did not develop RA within 1 year

Patient characteristicsRA-RA group (n = 62)p Value*UA-RA group (n = 91)UA at presentation, no RA at 1 year (n = 238)
*p Value of RA-RA group versus UA-RA group.
Results are shown as number (%) or median (interquartile range).
Age (years)53 (42–72)0.68355 (44–65)46 (35–58)
Female patients43 (69)0.49258 (64)119 (50)
Duration of symptoms at first visit (days)130 (61–278)0.611131 (73–230)81 (20–164)
Duration of morning stiffness (min)90 (45–150)0.03560 (18–120)15 (0–60)
Number of swollen joints7 (5–8)<0.0014 (2–6)2 (1–3)
Modified DAS score3.5 (3.1–4.0)0.0123.2 (2.7–3.7)2.3 (1.9–2.8)
Rheumatoid factor positive44 (71)0.00138 (42)28 (12)
Anti-CCP antibodies35/59 (59)0.39743/83 (52)16 (8.2)
ESR (mm/1st h)38 (20–56)0.69531 (19–53)18 (9–37)
CRP (mg/l)24 (9–41)0.41417 (8–46)10 (4–26)
HAQ score1.0 (0.6–1.4)0.1840.8 (0.4–1.2)0.6 (0.1–1.0)
Erosive disease at baseline (hands and feet radiographs)18/60 (30)1.00026/88 (30)20 (13)
Sharp/van der Heijde score1 (0–4)0.2810 (0–3)0 (0–0)