Table 2.

Respiratory parameters collected with standard oxygen therapy and shortly after start of helmet CPAP

	Standard oxygen N = 306	Helmet CPAP N = 306	P value
PaO2/FiO2 ratio, mmHg	103 [79–176]	202 [146–284]	< 0.001*
O2 saturation, %	95 [91–97]	98 [96–99]	< 0.001*
PaCO2, mmHg	33 [30–36]	33 [30.5–36]	0.011*
Resp rate, BPM	28 [22–32]	24 [20–29]	< 0.001*

BPM: breaths per minute; PEEP: positive end expiratory pressure; CPAP: continuous positive airway pressure; ARDS: acute respiratory distress syndrome

*Indicates persistence of statistically significant differences after Bonferroni correction for multiple comparisons (p < 0.012)