Table 2. Baseline characteristics of the patients

Characteristics	Total (n=46)
Age (year), mean±SD	49.8±15.5
Male, n (%)	32 (69.6%)
BMI (kg/m2), mean±SD	24.7±4.4
Predicted body weight (kg)	58.5±6.5
SOFA score, median IQR	10.7±3.7
APACHE II score, median IQR	19.0 [16.3–26.8]
ARDS classification, n (%)
Moderate (PaO2/FiO2<200)	35 (76.1)
Severe (PaO2/FiO2<100)	11 (23.9)
ARDS risk factors, n (%)
Pneumonia	18 (39.1)
Sepsis or septic shock	17 (37.0)
Lung contusion	4 (8.7)
Pancreatitis	4 (8.7)
Other	3 (6.5)
Outcomes
Ventilator days (days)	12 [8–20]
Length of ICU stay (days)	13.5 [10–21]

BMI, body mass index; SOFA, Sequential Organ Failure Assessment; IQR, interquartile range; APACHE II, Acute Physiology and Chronic Health Evaluation II; ARDS, acute respiratory distress syndrome; PaO₂, partial pressure of arterial oxygen; FiO₂, fraction of inspired oxygen; ICU, intensive care unit.