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Table 1 Characteristics of JIA patients participating in the two periods of surveillance for acute respiratory infections and in the phase of vaccination against influenza virus

From: Prospective surveillance study of acute respiratory infections, influenza-like illness and seasonal influenza vaccine in a cohort of juvenile idiopathic arthritis patients

  SV 1 SV 2 Vaccination
Patients (n) 61 63 44
Age, mean (years) 10.7 10.9 11.0
ILAR categories n (%)    
Oligoarthritis extended 8 (13.1) 12 (19) 9 (20.4)
Oligoarthritis persistent 12 (19.6) 11 (17.4) 11 (25)
Polyarticular RF - 20 (32.7) 19 (30.1) 12 (27.3)
Polyarticular RF+ 4 (6.5) 5 (7.9) 4 (9)
Systemic 13 (21.3) 13 (20.6) 7 (16)
Undifferentiated arthritis 4 (6.5) 3 (4.8) 1 (2.3)
Use of immunosuppressant, DMARDS or anti-TNF drugs, n (%) 34 (55.7) 43 (68.2) 31(70)
Use of corticosteroids, n (%) 5 (8.2) 5 (7.9) 6 (13.6)
(mean daily dose corticosteroids: mg/kg/day) 0.45 (0.05-1) 0.34 (0.1-0.5) 0.3 (0.1-0.6)
Active disease n (%) 21 (34.4) 25 (39.6) 25(57)
  1. Surveillance for respiratory infections: from March to August 2007- surveillance 1 (SV1) and from March to August 2008 – surveillance 2 (SV2). ILAR: International League of Associations for Rheumatology, RF: rheumatoid factor.