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Table 1 Baseline characteristics of early diagnosed untreated rheumatoid arthritis patients and healthy controls

From: Blood chemokine profile in untreated early rheumatoid arthritis: CXCL10 as a disease activity marker

  ueRA Healthy controls
Number 43 14
Female (n (%)) 30 (69.7) 9 (64.2)
Age (years) a,b,c 61 (22–78) 62.5 (35–72)
Symptom duration (months) a,b,d 6 (2–23) ND
CRP (mg/L) a,b 9.1 (0.3–152) ND
ESR (mm/hour) a,b 26 (5–108) ND
Swollen joint count of 66 a,b 11 (2–30) ND
Tender joint count of 68 a,b 14 (3–47) ND
Swollen joint count of 28 a,b 9 (2–22) ND
Tender joint count of 28 a,b 9 (0–27) ND
DAS28-CRP a,b 5.1 (2.7–8) ND
DAS28-ESR a,b 5.3 (2.6–8.4) ND
CDAI a,b 28.1 (11.8–62.1) ND
ACPA ≥20 IU/ml (n (%)) 34 (79) ND
RF ≥20 IU/ml (n (%)) 33 (77) ND
ACPA ≥20 IU/ml + RF ≥20 IU/ml (n (%)) 30 (70) ND
ACPA <20 IU/ml + RF <20 IU/ml (n (%)) 5 (12) ND
  1. aMedian and bRange
  2. c P = 0.68 (statistical analysis between ueRA and healthy controls, Mann–Whitney U test)
  3. dRetrospective patient-reported pain in the joints before RA diagnosis
  4. ACPA anti-citrullinated protein/peptide antibodies, CDAI Clinical Disease Activity Index, CRP C-reactive protein, DAS28 Disease Activity Score 28, ESR erythrocyte sedimentation rate, ND not determined, RF rheumatoid factor, ueRA untreated early rheumatoid arthritis