Table 1C.

Subgroups of patients' clinical data for the LOS prediction.

Variables	LOS
	≤6 days (988 patients)	>6 days (1,236 patients)
	Mean ± SD	Mean ± SD	p-value
Age (years)	57.89 ± 16.61	59.82 ± 16.59	*
Perfusion index	1.74 ± 1.81	1.67 ± 1.63	>0.05
P(v-a)CO2/C(a-v)O2	1.64 ± 0.52	1.61 ± 0.61	>0.05
pCO2 (mmHg)	37.46 ± 8.06	38.64 ± 9.82	**
Noradrenaline dosage (μg/kg/min)	0.53 ± 1.36	0.39 ± 0.45	**
Adrenaline dosage (μg/kg/min)	0.17 ± 0.11	0.16 ± 0.05	**
Invasive blood pressure (mmHg)	94.49 ± 20.91	89.02 ± 19.44	**
Central venous pressure (mmHg)	9.02 ± 3.16	9.64 ± 3.37	**
P(v-a)CO2 (mmHg)	5.62 ± 2.07	5.32 ± 2.25	**
sO2 (%)	96.67 ± 4.65	96.13 ± 4.41	*
Lactic acid (mmol/l)	2.94 ± 3.11	2.77 ± 2.72	>0.05
Invasive systolic blood pressure (mmHg)	139.41 ± 28.76	136.90 ± 27.59	*
Invasive diastolic blood pressure (mmHg)	71.59 ± 15.24	67.00 ± 14.15	**
Oxygenation index	337.15 ± 145.09	271.89 ± 138.34	**
White blood cell (×109/l)	13.08 ± 8.04	14.62 ± 9.12	**
Platelet (×109/l)	174.57 ± 98.89	169.85 ± 105.31	>0.05
Total bilirubin (μmol/l)	33.11 ± 58.50	29.33 ± 48.42	>0.05
GCS score	10.04 ± 4.48	8.71 ± 4.50	**
Creatinine (μmol/l)	105.55 ± 119.71	148.69 ± 156.39	**
Oxygen concentration (%)	44.31 ± 15.79	51.06 ± 19.80	**
SpO2 (%)	97.85 ± 3.48	97.07 ± 3.94	**
pO2 (mmHg)	113.13 ± 43.03	102.55 ± 41.68	**
Heart rate (bpm)	99.68 ± 22.26	103.93 ± 21.07	**
Body temperature (°C)	36.68 ± 1.00	37.08 ± 1.04	**
Respiratory rate (bpm)	19.41 ± 5.96	21.46 ± 6.86	**
SOFA score	8.37 ± 3.89	10.08 ± 3.88	**

^**p < 0.01,

^*p < 0.05