Resuscitation of extremely preterm infants - controversies and current evidence

Table 1 Studies reporting the outcomes of antenatal steroid use in periviable births

Ref.	Year published	Country of origin	No. of babies	Birth weight(g)	Gestational age (GA)	MortalityOR (95%CI)	IVHOR (95%CI)
Costeloe et al[10]	2000	United Kingdom	811	400-1000	< 26 wk	0.6 (0.34-0.89)	0.39 (0.2-1.0)
Tyson et al[11]	2008	United States	4446	400-900	< 26 wk	0.6 (0.23-0.78)	-
Hayes et al[12]	2008	United States	450	400-550	< 23 wk	0.3 (0.2-0.65)	-
Mori et al[13]	2011	Japan	11607	400-1000	< 26 wk	0.7 (0.44-1.24)	0.65 (0.21-1.68)
Bader et al[14]	2010	Israel	3450	400-1000	< 26 wk	0.6 (0.4-0.68)	-
Carlo et al[15]	2011	United States	10541	400-1000	22-25 wk	0.58 (0.52-0.65)	0.55 (0.50-0.62)

OR: Odds ratio; IVH: Intra-ventricular haemorrhage.