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Table 1 Baseline characteristics of the total group of patients with early arthritis and the subgroups of patients with rheumatoid arthritis (RA) or undifferentiated arthritis (UA)

From: MRI-detected osteitis is not associated with the presence or level of ACPA alone, but with the combined presence of ACPA and RF

Variable All patients with early arthritis Subgroup of patients with RA or UA
(n = 589) (n = 397)
Age, mean (sd) 54.8 (16) 54.9 (15)
Female, n (%) 363 (62) 253 (64)
Symptom duration, median (IQR), weeks 12.6 (5–27) 12.2 (5–26.2)
TJC, median (IQR) 4 (2–7) 4 (2–6)
SJC, median (IQR) 3 (2–7) 3 (2–7)
CRP (mg/L), median (IQR) 5.7 (3–17) 6 (3–17)
ACPA positivity, n (%) 141 (24) 123 (31)
RF positivity, n (%) 193 (33) 151 (38)
anti-CarP positivity, n (%) 88 (15) 71 (18)
Total RAMRIS, median (IQR) 12.5 (5.5–24) 13.5 (6–24)
 Total BME score, median (IQR) 2.5 (1–6) 2.5 (1–6)
 Total synovitis score, median (IQR) 3.5 (1–7.5) 4 (1.5–8)
 Total tenosynovitis score, median (IQR) 2 (0–6) 3 (0.5–6)
  1. The diagnoses of the 589 patients with early arthritis were: 183 RA (according to the 1987 RA criteria), 214 UA, 14 reactive arthritis, 14 gout, 2 pseudogout, 30 psoriatic arthritis, 35 inflammatory osteoarthritis, 4 Lyme’s arthritis, 1 paramalignant arthritis, 3 systemic lupus erythematosus, 11 other systemic disorder, 7 mixed connective tissue disease, vasculitis, 4 sarcoidosis, 9 spondyloarthritis, 8 remitting seronegative symmetrical synovitis with pitting edema, and 50 other unspecified conditions. n number of patients, sd standard deviation, IQR interquartile range, symptom duration time between symptom onset and inclusion in cohort, TJC 68 tender joint count, SJC 66 swollen joint count, CRP C-reactive protein, ACPA anti-citrullinated protein antibodies, RF rheumatoid factor, anti-CarP anti-carbamylated protein antibodies, RA/UA subgroup of patients with rheumatoid arthritis (according to the 1987 RA criteria) or undifferentiated arthritis