Fig. 4
From: Influence of different noninvasive oxygenation support devices on tidal volume
Physiological variables of healthy volunteers according to each device. Column bars represent the effect of each device on tidal volume (A, B), respiratory rate (C) and minute ventilation (D). p < 0.0001 for overall comparisons on one-way ANOVA. * denotes p < 0.05 vs. O2-mask. HFNC: high-flow oxygen through nasal cannula; CPAP: continuous positive airway pressure; NIV: noninvasive ventilation; PBW: predicted body weight