Mortality and associated factors of juvenile idiopathic arthritis in hospitalized Thai children: a nationwide data analysis 2015-2023.

Among 3,754 juvenile idiopathic arthritis admissions, 52.7% of patients were female, with a median age of 10 years (interquartile range 6-13).

Length of stay and costs were substantially higher among intubated patients and non-survivors.

Myocarditis showed the strongest association with intubation (aOR 294.74), followed by pulmonary hemorrhage, acute kidney injury, and septic shock.

Macrophage activation syndrome was identified in 43 admissions (1.2%) and was more frequent among non-survivors (23.5% vs 1.0%; P < 0.001).