Effects of each ventilator setting on Vte, delta pressure, and Vte/delta pressure in both nCPAP and FmCPAP. (A) Expired tidal volume obtained with nCPAP and FmCPAP. (B) Delta pressure measured in nCPAP and FmCPAP. (C) Vte/delta P in nCPAP and FmCPAP. Each box represents the interquartile range between the 25th and the 75th percentiles, with the median value shown as a horizontal line within the box. Vertical bars represent the maximum and minimum values except for outliers. Outliers identified with a circle are any data values which lie greater than 1.5 times the box length beyond the lower or higher edges of the box and within 3.0 times the box length. Outliers identified with a star are any data which lie more than 3.0 times the box length beyond the lower or higher edges of the box; 20/0, 20/5, and 20/10 represent peak inspiratory pressure (PIP) (cm H2O)/positive end-expiratory pressure (PEEP) (cm H2O). delta P, delta pressure; FmCPAP, continuous positive airway pressure via a full face mask and ventilation; nCPAP, continuous positive airway pressure via a nasal mask and ventilation; Vte, expired tidal volume (in milliliters per kilogram of ideal body weight).