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Table 6 Frequency of ILAR Categories by Geographic Area

From: Epidemiology and demographics of juvenile idiopathic arthritis in Africa and Middle East

  Northern Europe
(n = 845)
Western Europe
(n = 832)
Southern Europe
(n = 2400)
Eastern Europe
(n = 2044)
North America
(n = 523)
Latin America
(n = 849)
Africa and Middle East
(n = 1209)
Southeast Asia
(n = 379)
Systemic arthritis 42 (5.0) 57 (6.9) 204 (8.5) 167 (8.2) 22 (4.2) 149 (17.6) 204 (16.9) 125 (33.0)
Oligoarticular 340 (40.2) 317 (38.1) 1360 (56.7) 848 (41.5) 185 (35.4) 261 (30.7) 457 (37.8) 41 (10.8)
RF-negative polyarthritis 223 (26.4) 198 (23.8) 480 (20.0) 539 (26.4) 165 (31.5) 217 (25.6) 271 (22.4) 48 (12.7)
RF-positive polyarthritis 30 (3.6) 22 (2.6) 31 (1.3) 91 (4.5) 22 (4.2) 95 (11.2) 61 (5.0) 30 (7.9)
Psoriatic arthritis 35 (4.1) 40 (4.8) 88 (3.7) 54 (2.6) 37 (7.1) 13 (1.5) 37 (3.1) 5 (1.3)
Enthesitis related arthritis 87 (10.3) 125 (15.0) 130 (5.4) 254 (12.4) 56 (10.7) 83 (9.8) 111 (9.2) 113 (29.8)
Undifferentiated arthritis 88 (10.4) 73 (8.8) 107 (4.5) 91 (4.5) 36 (6.9) 31 (3.7) 68 (5.6) 17 (4.5)
  1. Data are number (%)
  2. ILAR = International League of Associations for Rheumatology
  3. Reprinted from Lancet Child Adolesc Health; 2019 3 (4):255-63. Reproduced with permission from copyright holder.