Figure 3. Bland-Altman plots comparing average parameters estimated using the balloon catheter measurement with those obtained using the air- or liquid-filled catheter, under different settings of BIPAP (biphasic positive airway pressure) mechanical ventilation.

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. The horizontal lines represent the mean (solid line) ± SD (dashed lines) of the difference between methods.