Table 1 Baseline demographic, clinical, and laboratory characteristics of patients with undifferentiated arthritis (UA)
Characteristic | Total UA (n = 111) | Pre-RA (n = 23) | Non-RA (n = 88) | p value (pre-RA vs non- RA) |
|---|---|---|---|---|
Sex (M/F) | 25/86 | 5/18 | 20/68 | 0.92 |
Age (years) | 48 (41–57) | 50 (44–59) | 47 (39–56) | 0.28 |
Anti-CCP (positive/negative) | 15/96 | 8/15 | 7/81 | <0.001 |
Symptom duration (months) | 6 (4–12) | 5 (4–12) | 7 (4.5–12) | 0.50 |
C-reactive protein (mg/l) | 4 (3–8) | 8 (4–14) | 4 (3–6) | <0.01 |
Swollen Joint Count (40) | 0 (0–2) | 1 (0–2) | 0 (0–2) | 0.03 |
Tender Joint Count (40) | 9 (5–20) | 15 (5–27) | 8 (4.5–17) | 0.05 |
Visual Analogue Scale – Doctor (0–100 mm) | 12 (5–24) | 24 (18–30) | 9 (3–19) | <0.001 |
Visual Analogue Scale – Pain (0–100 mm) | 36 (17–54) | 54 (21–69) | 34 (17–51) | 0.01 |
Visual Analogue Scale – Global (0–100 mm) | 41 (20–59) | 60 (40–71) | 36 (15–55) | <0.01 |
DAS28-CRP | 3.6 (2.9–4.3) | 4.1 (3.6–5.1) | 3.5 (2.7–4.2) | <0.01 |
HAQ score (0–3) | 0.4 (0–1) | 0.75 (0–1.3) | 0.37 (0–0.75) | 0.05 |
MRI wrist synovitis score | 3 (2–5) | 5 (3.5–5.5) | 3 (2–5) | <0.01 |
MRI wrist erosion score | 3 (1–5) | 4 (2–5.5) | 2 (0–4) | 0.01 |
MRI wrist bone marrow edema score | 0 (0–1) | 1 (0–2) | 0 (0–0) | <0.01 |