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Table 1

From: Nearly 20% of children are not correctly classified according to current ilar classification in a PRINTO dataset of more than 12,000 juvenile idiopathic arthritis patients

  N Provisional diagnosis
N (%)
Reasons for provisional diagnosis
N (%)
    Rheumatoid factor Psoriasis Spondylitis features HLA-B27
Systemic arthritis 1365 295 (21.6) 219 (74.2) 83 (28.1) 67 (22.7) 34 (11.5)
Oligoarthritis 4887 1127 (23.1) 837 (74.3) 353 (31.3) 314 (27.9) 144 (12.8)
Polyarthritis RF-negative 2991 379 (12.7) 273 (72) 183 (48.3) 157 (41.4) 69 (18.2)
Polyarthritis RF-positive 492 277 (56.3) 266 (96) 33 (11.9) 28 (10.1) 10 (3.6)
Psoriatic arthritis 433 101 (23.3) 63 (62.4) 22 (21.8) 23 (22.8) 7 (6.9)
Enthesitis related arthritis 1323 217 (16.4) 118 (54.4) 90 (41.5) - -
Total 12141 2396 (19.7) 1776 (74.1) 764 (31.9) 589 (24.6) 264 (11)