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Table 1 Baseline characteristics of the total population of UA patients and for the patients that did and did not develop RA within one year

From: The prognostic value of baseline erosions in undifferentiated arthritis

Characteristic Total (n = 518) Developed RA (n = 160) Did not develop RA (n = 358) P LR+ LR-
Female gender n (%) 305 (59) 111 (69) 194 (54) 0.001 1.3 0.67
Age in years (Mean ± SD) 50.6 ± 16.5 56.3 ± 15 48 ± 16.5 < 0.001 - -
Symptom duration at inclusion in months (Mean ± SD) 4.9 ± 5.5 5.9 ± 6 4.4 ± 5.1 0.002 - -
Morning stiffness (Mean ± SD) 55.7 ± 89.9 82.9 ± 111.4 43.6 ± 75.6 < 0.001 - -
Tender joint count (Mean ± SD) 6.5 ± 6.3 9.5 ± 7.4 5.1 ± 5.3 < 0.001 - -
Swollen joint count (Mean ± SD) 3.8 ± 4 5.7 ± 5.1 2.9 ± 3.1 < 0.001 - -
HAQ score (Mean ± SD) 0.76 ± 0.6 0.9 ± 0.6 0.7 ± 0.6 < 0.001 - -
ESR (mm/hr) (Mean ± SD) 28.9 ± 24.4 36.8 ± 23.7 25.3 ± 23.9 < 0.001 - -
CRP (mg/L) (Mean ± SD) 20.6 ± 28.2 26.5 ± 29.1 17.9 ± 27.4 < 0.001 - -
RF positivity n (%) 125 (24.2) 76 (47.5) 49 (13.7) < 0.001 3.5 0.61
ACPA positivity n (%) 114 (23.4) 76 (50) 38 (11.3) < 0.001 4.4 0.56
**Having erosive joints in hands and/or feet n (%) 148 (28.6) 67 (41.9) 81 (22.6) < 0.001* 1.8 0.75
   **Hands only n (%) 58 (11.2) 23 (14.4) 35 (9.8) 0.1 - -
   **Feet only n (%) 46 (8.9) 22 (13.8) 24 (6.7) 0.009 - -
   **Hands and feet n (%) 44 (8.5) 22 (13.8) 22 (6.2) 0.004 - -
SHS erosion score (mean ± SD) 0.8 ± 2 1.5 ± 3 0.5 ± 1.3 < 0.001 - -
  1. ACPA = anticyclic citrullinated peptide antibody; CRP = C-reactive protein; ESR = erythrocytic sedimentation rate; HAQ = health assessment questionnaire; LR+ = positive likelihood ratio; LR- = negative likelihood ratio; RA = rheumatoid arthritis; RF = rheumatoid factor; SD = standard deviation; SHS = Sharp/van der Heijde scoring; UA = undifferentiated arthritis.
  2. Morning stiffness score on a 100 mm visual analogue scale.
  3. * P value is calculated in reference to the no-erosion group; ** Defined as a broken cortex in at least 1 joint.