The Association Between Frailty, Pao 2 /Fio 2 Ratio, and Hospital Mortality: A Retrospective Registry-Based Cohort Study. - Subramaniam, Ashwin; Ling, Ryan Ruiyang; Burrell, Aidan; Moran, Benjamin; Ramanan, Mahesh; Ramanathan, Kollengode; Reddy, Mallikarjuna Ponnapa; Pilcher, David; Shekar, Kiran (Critical Care Medicine, 2025)