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Table 1 Clinical and demographic data of the rheumatoid arthritis patients at baseline

From: The PTPN221858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden

  Patients (n = 505) Controls (n = 970)
Age (years) 54.5 ± 14.0 57.4 ± 11.6
Sex (females/males) 342/163 (67.7/32.3) 705/265 (72.7/27.3)
Symptom duration (months) 6.3 ± 2.8 --
Prednisolone treatment (number receving prednisolone/total number of patients) 195/456 (42.8) --
Disease-modifying antirheumatic drug treatment (number receving DMARD/total number of patients) 348/403 (86.4) --
Smoking ever (current, past), (number ever smoking/total number of patients) 321/492 (65.2) 242/899 (26.9)
Anti-cyclic citrullinated peptide antibody-positive (number anti-CCP ab positive/total number of patients) 318/468 (67.9) 5/347 (1.4)
Rheumatoid factor-positive (number RF positive/total number of patients) 264/366 (72.1) --
  1. Data presented as the mean ± standard deviation or number ratio (percentage).