Table 2.

Bland-Altman analysis for ^X5 PVBC, ^X5 PVBC ² , ^X5 PVBCβ and ^X5 PVBCβ ² with reference to ΔPes/ΔPtp ^a

	X5 PVBC		X5 PVBC 2		X5 PVBCβ		X5 PVBCβ 2
	Mean	95% CI	Mean	95% CI	Mean	95% CI	Mean	95% CI
Bias	0.34	0.05	0.16*	0.06	0.33	0.05	0.16*	0.06
SD	0.10	0.01	0.10	0.02	0.09	0.02	0.08	0.02
Lower LoA	0.16	0.07	−0.04*	0.09	0.16	0.07	−0.01*	0.08
Upper LoA	0.56	0.07	0.35*	0.04	0.50	0.06	0.32*	0.06
Precision	0.40	0.06	0.39	0.07	0.34	0.07	0.33	0.08

^aCI, Confidence interval; LoA, Level of adjustment; ΔPes/∆Ptp, Ratio of inspiratory changes in esophageal and transpulmonary pressure; PVBCβ, Patient-ventilator breath contribution as ratio of inspiratory tidal volume for non-assisted to assisted breaths; ^X5PBVC, Patient-ventilator breath contribution calculated from single non-assisted breath compared with five averaged electrical activity of the diaphragm values from the five preceding breaths; SD, Standard deviation. *P <0.05 versus ^X5PVBC and ^X5PVBCβ.