ROX Index as a Predictor of Intubation Risk and 28-Day Mortality in COVID-19 Patients with Acute Respiratory Distress Syndrome Putra Kurnia Nugraha1, Arie Utariani2*, Philia Setiawan3, Bambang Pujo Semedi4 Abstract Background: The main concern when treating COVID-19 acute respiratory distress syndrome (ARDS) during high flow nasal cannula (HFNC) is delayed