Impact of Interleukin-1 Blockade on the Development of Macrophage Activation Syndrome in Still Disease: Incidence and Diagnostic Validity of the EULAR/ACR/PRINTO 2016 MAS Classification Criteria.

The MAS group had a higher percentage of female patients (83% [10 of 12] vs 48% [26 of 54]; P = 0.051) and a lower median age at sJIA‐SD diagnosis (MAS 3.32 years, range 0.93–16.6 years; no MAS 9.09 years, range 2.73–15.3 years; P = 0.084), but both differences did not reach statistical significance.

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