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Table 1 Baseline demographic, clinical and serological characteristics of the 192 patients with undifferentiated arthritis

From: Anti-cyclic citrullinated peptide antibody titer predicts time to rheumatoid arthritis onset in patients with undifferentiated arthritis: results from a 2-year prospective study

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   
   Positive, n 98 51.0
   Ratio, median (IR) 1.1 (0.6-4.1) na
ESR   
   Increased, n 103 53.6
   Ratio, median (IR) 22.5 (14-40) na
Rheumatoid factor   
   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   
   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   
   None, n 88 (45.8)
   NSAIDs/Coxibs, n 66 (34.4)
   Corticosteroids, n 10 (5.2)
  1. n, number of patients; CRP, C-reactive protein; IR, interquartile range; ESR, erythrocyte sedimentation rate; ACPA, anti-citrullinated peptide antibodies; NSAID, non-steroidal anti-inflammatory drug; Coxib, Cox-2 selective inhibitor; na, not applicable.