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Table 1 Baseline characteristics of patients with early inflammatory arthritis of non-crystal origin

From: Early rheumatoid arthritis is characterized by a distinct and transient synovial fluid cytokine profile of T cell and stromal cell origin

  RA Non-RA persistent Resolving P
Number 8 14 14  
Female (n) 4 6 6 NSa
Age (years)b,c 65.5 (55–73) 29.5 (23.5–61) 28.5 (21–45) 0.006d RA versus non-RA persistent <0.05e RA versus resolving <0.01e
Symptom duration (weeks)b,c 9 (6–9.5) 7.5 (2.5–11.5) 4 (2–8) NSd
CRP (mg/l)b,c 31 (27.5–52.5) 67 (29–172.5) 24 (3.5–45) NSd
RF ≥30 IU/ml (n) 7 0 2 <0.0001a
Anti-CCP antibodies ≥5 IU/ml (n) 7 0 1 <0.0001a
RF ≥30 IU/ml + Anti-CCP antibodies ≥5 IU/ml (n) 7 0 0 <0.0001a
Initial NSAID use (n) 7 6 8 NSa
Initial DMARD use (n) 0 0 0 NSa
Initial prednisolone use (n) 0 3 0 NSa
Joint aspirated (knee/ankle [n]) 5/3 13/1 11/3 NSa
  1. aχ2 test. bMedian. cInterquartile range. dKruskall–Wallis test. eWhere the medians were significantly different at the 5% level, Dunn's post-test was used to compare individual groups. CCP, cyclic citrullinated peptide; CRP, C-reactive protein; DMARD, disease-modifying antirheumatic drug; NS, not significant; NSAID, nonsteroidal antirheumatic drug; RA, rheumatoid arthritis; RF, rheumatoid factor.