. 2021 Apr;9(7):548. doi: 10.21037/atm-20-6407

Table 3. Arterial blood gas variables and hemodynamic variables before and after the spontaneous breathing trial for the successful (S) and filed (F) ventilator liberation groups.

Variables	Group	SBT start	SBT end	P value
				Main effect		Interaction (time × group)
				Time	Group	Interaction (time × group)
Arterial blood pH	S	7.49±0.03	7.49±0.03	0.351	0.13	0.06
Arterial blood pH	F	7.47±0.04	7.48±0.04	0.351	0.13	0.06
P_aO2, mmHg	S	103.5±25.4	98.6±30.9	0.499	0.528	0.799
P_aO2, mmHg	F	97.3±28.5	96±34.4	0.499	0.528	0.799
P_aCO2, mmHg	S	36.7±5.0	37.2±5.2	0.552	0.233	0.269
P_aCO2, mmHg	F	35.6±6.7	34.5±5.9	0.552	0.233	0.269
Bicarbonate (HCO₃^–), mmol/L	S	28.4±2.0*	28.5±2.3*	0.373	0.004	0.441
Bicarbonate (HCO₃^–), mmol/L	F	26.1±2.7	26.9±2.6	0.373	0.004	0.441
P_O2/F_IO2 ratio	S	258.7±63.5	246.5±77.3	0.499	0.528	0.799
P_O2/F_IO2 ratio	F	243.2±71.2	240±86.0	0.499	0.528	0.799
Mean arterial pressure, mmHg	S	98.2±12.0	99.1±13.0	0.775	0.973	0.489
Mean arterial pressure, mmHg	F	98.8±7.2	98.4±8.8	0.775	0.973	0.489
Heart rate, beats/min	S	89.0±20.6	94.3±15.5	0.659	0.776	0.095
Heart rate, beats/min	F	94.5±12.6	91.4±13.1	0.659	0.776	0.095

Data are presented as mean ± standard deviation. Comparison between the S and F ventilator liberation groups: *P<0.05. No significant differences were observed within each group before and after SBT. SBT, spontaneous breathing trial.