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Table 1 Characteristics of the study population at inclusion

From: How age and sex affect the erythrocyte sedimentation rate and C-reactive protein in early rheumatoid arthritis

Characteristic Mean (SD) or Median (IQR)*
Sex (female) 362/589 (61.5%)
Age (years) 57.34 (14.20)
Symptom duration (weeks) 14.00 (8.00-26.00)
Body mass index (kg/m2) 26.59 (4.44)
  Normal (N = 198) 22.64 (1.89)
  Overweight (N = 209) 27.09 (1.35)
  Obese (N = 97) 33.54 (3.23)
ESR (mm/hour) 21.00 (11.00-36.00)
CRP (mg/l) 7.00 (5.00-19.50)
28-Tender joint count 3.00 (0.00-7.00)
28-Swollen joint count 5.00 (2.00-9.00)
General health 44.55 (26.39)
DAS28-ESR 4.23 (1.51)
DAS28-CRP 4.00 (1.35)
SF36 – physical health 37.41 (9.32)
SF36 – mental health 48.13 (11.59)
HAQ 0.99 (0.72)
Anti-CCP positive 139/228 (61.0%)
Rheumatoid factor positive 285/520 (54.8%)
  1. *The values for sex, RF and anti-CCP positivity are the number of patients/number of patients assessed. DAS-28 = disease activity score for 28 joints, ESR = erythrocyte sedimentation rate, CRP = C-Reactive Protein, SF36 = Short Form Health Survey with 36 items, HAQ = Health Assessment Questionnaire.