Table 2.

Mean airway pressure – medium prong size

	20 L/min	30 L/min	40 L/min	50 L/min	nCPAP (6 mbar)	nCPAP (10 mbar)	nBiPAP (14/6 mbar)
Mean (mbar) ± SD	0.92±0.49	1.44±0.78	2.14±0.98	3.01±1.03	4.96±1.34	8.56±2.02	7.46±1.77
P-value	<0.01	<0.03	<0.03	<0.03	<0.01	<0.01	>0.05

Notes: P-value to refer to zero in case of 20 L/min, in all other cases in comparison to previous applied device (for instance, P-value in nBiPAP describes no significant difference to nCPAP 10 mbar or for instance, a flow rate of 50 L/min increases mean airway pressure significantly compared to 40 L/min).

Abbreviations: nBiPAP, (nasal) bilevel positive airway pressure; nCPAP, (nasal) continuous positive airway pressure; SD, standard deviation.