Table 2.

Statistical description of the training set and validation set in the study

Features (mean ± SD)	Training set (n = 4747)	Validation set (n = 1188)
Age	63.83 ± 16.37	63.22 ± 16.29
SAPS II	40.21 ± 15.04	39.56 ± 14.85
SOFA scores	5.49 ± 3.53	5.36 ± 3.48
White blood cell (WBC)	12.52 ± 8.98	12.44 ± 6.27
Hemoglobin (Hb)	10.67 ± 1.90	10.74 ± 1.93
Hematocrit	31.91 ± 5.51	32.07 ± 5.48
Platelet	210.77 ± 109.94	210.00 ± 108.69
Urea nitrogen (BUN)	25.31 ± 20.39	24.95 ± 20.04
pH	7.37 ± 0.07	7.37 ± 0.07
pO2	189.14 ± 85.98	191.54 ± 89.92
pCO2	41.91 ± 8.66	41.53 ± 8.06
Bicarbonate (HCO3−)	23.62 ± 4.21	23.57 ± 4.01
Lactate (Lac)	2.23 ± 1.45	2.26 ± 1.52
Potassium (K)	4.22 ± 0.54	4.22 ± 0.57
Sodium (Na)	138.17 ± 4.04	138.17 ± 4.16
Chlorine (Cl)	105.33 ± 5.29	105.28 ± 5.37
Total calcium (TotalCa)	8.24 ± 0.74	8.23 ± 0.73
Partial thromboplastin time (PTT)	35.81 ± 15.29	36.14 ± 15.82
Fluid balance	4580.69 ± 9379.25	4687.70 ± 4268.08
Positive expiratory end pressure (PEEP)	5.99 ± 2.01	5.87 ± 1.90
Oxygen concentration in the inhalation gas (FiO2)	56.06 ± 13.29	55.37 ± 12.74
Tidal volume (VT)	520.06 ± 178.15	517.18 ± 159.60
Peak airway pressure (Ppeak)	20.28 ± 5.62	20.36 ± 5.50
Mean airway pressure (Pmean)	9.45 ± 2.85	9.40 ± 2.77
Platform pressure (Pplat)	18.29 ± 4.18	18.23 ± 3.97
Heart rate (HR)	86.06 ± 15.41	86.05 ± 15.63
Mean arterial pressure (MAP)	78.35 ± 11.68	78.42 ± 11.28
Respiratory rate (RR)	18.76 ± 3.71	18.62 ± 3.85
Temperature	36.83 ± 0.68	36.84 ± 0.67
Pulse oxygen saturation (SpO2%)	97.55 ± 2.26	97.61 ± 2.19
Richmond-ASS scores	− 1.59 ± 1.49	− 1.59 ± 1.55
Dexmedetomidine	0.12 ± 0.77	0.12 ± 0.64
Fentanyl	3.52 ± 11.43	3.12 ± 9.97
Midazolam	65.45 ± 296.75	55.62 ± 208.40
Morphine	15.23 ± 84.53	13.07 ± 38.04
Propofol	3929.18 ± 8581.78	4066.48 ± 9464.44