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Table 7 Baseline characteristics of the UA patients with erosions (≥2 erosive joints) that did and did not progress to RA within one year

From: The prognostic value of baseline erosions in undifferentiated arthritis

Characteristic Total (n = 83) Developed RA (n = 44) Did not develop RA (n = 39) P
Female gender n (%) 44 (53) 26 (53.8) 18 (46.2) 0.2
Age in years (Mean ± SD) 61.5 ± 16 60.7 ± 16.4 62.5 ± 15.6 0.6
Symptom duration at inclusion in months (Mean ± SD) 6.5 ± 6.3 7.1 ± 7.4 5.7 ± 4.8 0.9
Morning stiffness (Mean ± SD) 74.9 ± 100.5 92.2 ± 114.4 55.4 ± 78.9 0.04
Tender joint count (Mean ± SD) 6.9 ± 5.8 9 ± 6.7 4.6 ± 3.7 <0.001
Swollen joint count (Mean ± SD) 4.7 ± 4 6 ± 4 3.2 ± 3.4 <0.001
HAQ score (Mean ± SD) 0.89 ± 0.74 0.9 ± 0.73 0.87 ± 0.75 0.9
ESR (mm/hr) (Mean ± SD) 34.7 ± 24.7 41.3 ± 24 27.2 ± 23.6 0.004
CRP (mg/L) (Mean ± SD) 27.8 ± 31.4 33.4 ± 30.4 21.5 ± 31.7 0.005
RF positivity n (%) 31 (37.3) 22 (50) 9 (23.1) 0.01
ACPA positivity n (%) 25 (32.5) 20 (51.3) 5 (13.2) < 0.001
SHS erosion score (mean ± SD) 4.2 ± 3.4 4.7 ± 4.3 3.7 ± 1.8 0.4
  1. ACPA = anticyclic citrullinated peptide antibody; CRP = C-reactive protein; ESR = erythrocytic sedimentation rate; HAQ = health assessment questionnaire; RA = rheumatoid arthritis; SD = standard deviation; SHS = Sharp/van der Heijde scoring; UA = undifferentiated arthritis.
  2. Morning stiffness score on a 100-mm visual analogue score.