. 2014 Sep 23;9(9):e103057. doi: 10.1371/journal.pone.0103057

Table 1. Bias (precision) of parameters estimated using the liquid- or air-filled catheters compared to those obtained with the balloon catheter, in different conditions.

balloon Vs.	E_L			E_cw			ΔP_trans			P_trans,endexp			PTP			WOB_i
	[cmH₂O/L]			[cmH₂O/L]			[cmH₂O]			[cmH₂O]			[cmH₂O•s]			[cmH₂O•L]
spont BIPAP	7.9	(8.2)	^**				−1.3	(1.5)	^**	−0.3	(2.2)		0.8	(0.6)	^***	0.3	(0.3)
contr BIPAP	−2.7	(5.3)		1.8	(5.3)		−1.0	(2.4)		0.1	(2.2)
contr MV	−2.0	(5.0)	^**	2.0	(5.0)	^**	−0.6	(1.4)	^**	−1.1	(1.4)	^***
spont BIPAP	7.7	(7.6)	^**				0.3	(0.9)		−0.9	(2.4)		0.4	(1.0)		0.2	(0.5)
contr BIPAP	0.8	(7.4)		−1.6	(7.0)		−0.5	(3.0)		−0.9	(2.5)
contr MV	2.4	(5.5)	^**	−2.4	(5.5)	^**	0.6	(1.6)	^*	−1.2	(2.0)	^***

BIPAP: biphasic positive airway pressure; contr MV: controlled mechanical ventilation (with animal paralyzed using atracurium bromide); contr BIPAP: assisted ventilation (allowing unsupported spontaneous breaths), considering only the controlled breaths; spont BIPAP: assisted ventilation, considering only the unsupported spontaneous breaths. E_L, E_cw: lung and chest wall elastance; ΔP_trans: inspiratory change in transpulmonary pressure; P_{trans,end-exp}: end-expiratory value of transpulmonary pressure; PTP: pressure-time product; WOB_i: inspiratory work of breathing. Significance of t-test:

*p<0.05;

**p<0.01;

***p<0.001.