3.Some factors associated with mortality rate of ARDS in chidlren include: origin related to measles, pre-treatment PaO2 ≤ 80 mmHg, pre-treatment P / F index ≤ 100, pre-treatment S / F index ≤ 117, pre-treatment OI index > 18.5, pre-treatment OSI > 15, followed by multiple organ failure.