Table 2.

Comparison between responders and non-responders

	Responders	Non-responders
	(n = 18)	(n = 6)	P
Birth weight (g)	3180 ± 190.2	2970 ± 329.4	0.59
Gestational age (weeks)	39 ± 0.58	39 ± 1	0.96
OI pre INO	42.9 ± 5.8	56 ± 10	0.25
OI during INO	11.3 ± 3.5	39 ± 6	0.0007*
a/A pre INO	0.09 ± 0.008	0.071 ± 0.014	0.28
a/A during INO	0.315 ± 0.021	0.137 ± 0.063	0.0003*

OI, oxygenation index; a/A, arterial/alveolar oxygen ratio; INO, inhalational nitric oxide. All values shown as mean ± SEM; ^*P < 0.05.