Table 1 Baseline demographic, clinical and serological characteristics of the 192 patients with undifferentiated arthritis
Characteristics | Baseline values | Percent patients |
|---|---|---|
Age, years, mean ± SD | 52 ± 16 | na |
Female, n | 147 | 76.6 |
Monoarthritis, n | 18 | 9.4 |
Oligoarthritis, n | 57 | 29.7 |
Polyarthritis, n | 117 | 60.9 |
Arthritis of hand joints, n | 126 | 65.6 |
CRP | Â | Â |
   Positive, n | 98 | 51.0 |
   Ratio, median (IR) | 1.1 (0.6-4.1) | na |
ESR | Â | Â |
   Increased, n | 103 | 53.6 |
   Ratio, median (IR) | 22.5 (14-40) | na |
Rheumatoid factor | Â | Â |
   Positive | 79 | (41.4) |
   Ratio, median (IR) | 0.7 (0.5-3.9) | na |
   Low titer on total positive | 26 | (32.9) |
   High titer on total positive | 53 | (67.1) |
ACPA | Â | Â |
   Positive, n | 80 | (41.7) |
   Ratio, median (IR) | 0.5 (0.3-7.8) | na |
   Low levels on total positive, n | 13 | (16.2) |
   High levels on total positive, n | 67 | (83.8) |
Baseline therapy | Â | Â |
   None, n | 88 | (45.8) |
   NSAIDs/Coxibs, n | 66 | (34.4) |
   Corticosteroids, n | 10 | (5.2) |