JOURNAL ARTICLE

Determinants of discordance between criteria for inactive disease and low disease activity in juvenile idiopathic arhritis

Gabriella Giancane, Chiara Campone, Maria Francesca Gicchino, Alessandra Alongi, Cecilia Bava, Silvia Rosina, Yaryna Boyko, Neil Martin, Yasser El Miedany, Miroslav Harjacek, Soad Hashad, Maka Ioseliani, Ruben Burgos-Vargas, Rik Joos, Christiaan Scott, Manel Mejbri, Zoilo Morel Ayala, Maria Ekelund, Safiya Al-Abrawi, Maya-Feriel Aiche, Ximena Norambuena, Jose Antonio Melo-Gomes, Nicolino Ruperto, Alessandro Consolaro, Angelo Ravelli
Arthritis Care & Research 2020 August 16
33242352

OBJECTIVE: To assess concordance among criteria for inactive disease (ID) and low disease activity (LDA) in juvenile idiopathic arthritis (JIA), and to seek for factors driving discordance.

METHODS: The frequency of fulfillment of existing criteria was evaluated in 10,186 patients extracted from three cross-sectional datasets. Patients were divided in the "functional phenotypes" of oligoarthritis and polyarthritis. Concordance between criteria was examined through weighted Venn diagrams. The role of each individual component in explaining discordance between criteria was assessed by calculating the absolute number and percentage of instances in which the component was responsible for discrepancy between definitions.

RESULTS: ID criteria were met by 28.6 to 41.1% of patients with oligoarthritis and by 24.0 to 33.4% of patients with polyarthritis. LDA criteria were met by 44.8 to 62.4% of patients with oligoarthritis and by 44.6 to 50.4% of patients with polyarthritis. There was a 57.9 to 62.3% overlap between ID criteria and a 67.9 to 85% overlap between LDA criteria. Parent and physician global assessments and acute phase reactants were responsible for the majority of instances of discordance among ID criteria (8.7-15.5%, 10.0-12.3%, and 10.8-17.3%, respectively).

CONCLUSION: We found fair concordance between criteria for ID and LDA in JIA, with the main drivers of discordance for ID being physician and parent global assessments, and acute phase reactants. This observation highlights the need for further studies aimed to evaluate the impact on ID definition of physician and parent subjective perception of disease remission and of laboratory measures of inflammatory activity.

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