Data extraction
The highest SOFA score and 6 SOFA component scores (including respiratory system score, coagulation system, liver system score, renal system score, cardio vascular system score, and nervous system score) in SOFA score were collected on the first 24 h of admission. The six organ function scores were set to 0–4. Baseline characteristics and outcome variable were also collected at admission to the ICU including age, sex, hospital mortality or not. All of the above data were extracted within 24 h of admission.