Table 1.

Demographic and clinical characteristics of study patients, considered as a whole and by occurrence of uveitis. Data are the number (percentages) unless otherwise indicated.

CharacteristicAll Patients, n = 1189Patients without Uveitis, n = 911Patients with Uveitis, n = 278p
Sex0.796
  Male259 (21.8)200 (22)59 (21.2)
  Female930 (78.2)711 (78)219 (78.8)
ILAR category0.413
  Persistent oligoarthritis628 (52.8)482 (52.9)146 (52.5)
  Extended oligoarthritis173 (14.6)127 (13.9)46 (16.5)
  RF-negative polyarthritis276 (23.2)210 (23.1)66 (23.7)
  Psoriatic arthritis40 (3.4)35 (3.8)5 (1.8)
  Undifferentiated arthritis72 (6.1)57 (6.3)15 (5.4)
Antinuclear antibody status< 0.0001
  Positive873 (73.4)620 (68.1)253 (91)
  Negative228 (19.2)216 (23.7)12 (4.3)
  Undetermined88 (7.4)75 (8.2)13 (4.7)
Age at onset of arthritis, yrs, median (IQR)3.2 (1.9; 6.3)3.8 (2; 7.2)2.1 (1.6; 3.4)< 0.0001
Age at onset of uveitis, yrs, median (IQR)4 (2.7; 5.8)
Disease duration, yrs, median (IQR)4.8 (2.3; 8.7)*1.1 (0.2; 2.5)**
Patients with disease duration < 2 yrs*204 (22.4)
Patients with disease duration < 5 yrs*479 (52.6)
  • * From onset of arthritis to last followup visit.

  • ** From onset of arthritis to onset of uveitis. The percentage of females was 78.4 in persistent oligoarthritis, 83.3 in extended oligoarthritis, 80.4 in RF-negative polyarthritis, 57.5 in psoriatic arthritis, and 65.3 in undifferentiated arthritis. ILAR: International Leagues of Associations for Rheumatology; RF: rheumatoid factor; IQR: interquartile range.