Method
death
Patients admitted to the Intensive Care Department of Tianjin Third Central Hospital (Grade III, Class A) with 30 comprehensive ICU beds from March 1, 2020 to September 30, 2021 were selected as the study subjects, and the study was approved by the Ethics Committee of Tianjin Third Central Hospital. All subjects were followed up to 90 days after discharge, with death as an end point.