Classification of Nonsystemic Juvenile Idiopathic Arthritis Using the Provisional Paediatric Rheumatology International Trials Organisation Criteria
Authors' conclusion
The provisional PRINTO criteria successfully reclassified a substantial proportion of previously undifferentiated JIA cases, improving diagnostic categorization by addressing some ILAR classification limitations.
Study context
- Population
- Patients with nonsystemic juvenile idiopathic arthritis (JIA) at a single tertiary pediatric rheumatology center; mean age at enrollment 169.8 (SD 59.2) months
- Participants
- 310 patients
- Exposure
- Provisional Paediatric Rheumatology International Trials Organisation (PRINTO) criteria vs International League of Associations for Rheumatology (ILAR) criteria for classification of nonsystemic JIA
- Outcome
- Distribution of JIA categories under ILAR and provisional PRINTO criteria
Methodological detailssingle-centre, tertiary pediatric rheumatology center
- Single-centre
- Tertiary pediatric rheumatology center
Main finding
As reported in the abstract
Distribution of JIA categories
- ILAR: oligoarticular JIA
- 136 (43.9%)
- ILAR: enthesitis-related arthritis
- 73 (23.5%)
- ILAR: Rheumatoid factor (RF)-negative polyarticular JIA
- 34 (11%)
- ILAR: Psoriatic arthritis (PsA)
- 12 (3.9%)
- ILAR: RF-positive polyarticular JIA
- 7 (2.3%)
- ILAR: undifferentiated JIA
- 48 (15.5%)
- PRINTO: early-onset ANA-positive JIA
- 107 (34.5%)
- PRINTO: other JIA
- 93 (30%)
- PRINTO: enthesitis/spondylitis-related JIA
- 88 (28.4%)
- PRINTO: RF-positive JIA
- 17 (5.5%)
- PRINTO: unclassified JIA
- 5 (1.6%)
Observational data: associations, not effects.
Further findings
ILAR categories within PRINTO other JIA (n = 93)
- Oligoarticular JIA
- 54.8%
- RF-negative polyarticular JIA
- 21.5%
- Undifferentiated JIA
- 11.8%
- Enthesitis-related arthritis
- 6.5%
- PsA
- 5.4%
Original publication
Classification of Nonsystemic Juvenile Idiopathic Arthritis Using the Provisional Paediatric Rheumatology International Trials Organisation Criteria. J Rheumatol. Published 1 February 2026. doi:10.
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