Pediatric rheumatology

Patterns of clinical joint inflammation in juvenile idiopathic arthritis

RMD OpenPublished Secondary analysis of the BeSt for Kids treat-to-target trial

Primary result · Joint inflammation during follow-up in the same jointResult — go to the resultOdds ratio 3.9 95% CI 3.5–4.4

Authors' conclusion

In JIA, joint inflammation has the tendency to recur multiple times in joints that are clinically inflamed at disease onset.

Study context

Population
Children with recent-onset oligoarticular, RF-negative polyarticular and psoriatic juvenile idiopathic arthritis (JIA) in the BeSt for Kids study, clinically assessed during 2 years (10 study visits)joints of 91 patients
Participants
6,097 children
Comparison
Joints clinically inflamed at baseline vs joints not inflamed at baseline
  • Inflamed at baselinen = 897
Primary endpoint
Joint inflammation during follow-up in the same joint
Follow-up
2 years
Methodological detailsjoint-level analysis, multilevel mixed-effects logistic regression, Poisson model
  • Joint-level analysis
  • Multilevel mixed-effects logistic regression
  • Poisson model

Primary result

As reported in the abstract

Odds ratio

3.9

95% CI 3.5–4.4

Events by treatment group

Inflamed at baseline

42%

377 of 897

Inflamed at baselinevs Not inflamed at baseline
OR 3.9 (95% CI 3.5–4.4)

Further findings

OutcomeIRR (95% CI)
Number of episodes of recurrent joint inflammation1.6 (1.2–2.1)

Joints clinically inflamed at baseline

Joints clinically inflamed at baseline (897 of 6097)
15%

Original publication

Patterns of clinical joint inflammation in juvenile idiopathic arthritis. RMD Open. Published 16 March 2023. doi:10.1136/rmdopen-2022-002941

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