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Table 1 Characteristics of patients with rheumatoid arthritis (RA), non-RA controls, and healthy controls

From: Periodontitis in established rheumatoid arthritis patients: a cross-sectional clinical, microbiological and serological study

  Patients with RA Non-RA controls Healthy controls
Number 95 44 36
Female, percentage 68 57 56
Age in years (SD) 56 (11) 54 (9.7) 34 (15)
Current smoker, percentage 23 27 14
Former smoker, percentage 40 43 0
Body mass index 25.8 (4.9) 25.4 (4.4) NA
Number of teeth 23.4 (6.3) 24.2 (4.9) 27.8 (2.9)
RA duration in years (SD) 7.4 (5.9) 0 0
DAS28 (SD) 2.4 (0.93) 0 0
Seropositive for IgM-RF, percentage 53 0 NA
Seropositive for ACPAs, percentage 71 NA NA
Medication for RA, percentage    
   None 6 100 100
   DMARDs 79 0 0
   Anti-TNFα 15 0 0
  1. ACPA, anti-citrullinated protein antibody; anti-TNFα, anti-tumor necrosis factor-alpha; DAS28, disease activity score 28 tender and swollen joint count; DMARD, disease-modifying anti-rheumatic drug; IgM-RF, immunoglobulin M-rheumatoid factor; NA, not assessed; SD, standard deviation.