2.4. Variables
The demographic data (age, gender, BMI, smoking history, comorbidities), Charlson Comorbidity Index (CCI), Acute Physiology and Chronic Health Evaluation (APACHE) II, and Sequential Organ Failure Assessment (SOFA) Scores, were recorded. Disease characteristics for COVID-19 including the date for symptom onset, RT-PCR results, radiological, and blood tests were collected. Major events during ICU stay (presence of septic shock, presence of cardiac injury, ICU acquired infections including VAP, mechanical ventilation support, AKI, and renal replacement therapy [RRT]) were recorded. The durations from symptom onset of the disease to the development of NOAF were recorded. Lengths of ICU, and hospital stays, and mortality were recorded.