Noninvasive Ventilation with Heliox for Respiratory Distress Syndrome in Preterm Infant: A Systematic Review and Meta-Analysis

Table 1

The characteristics of included papers.

	N ()		Gestational age (weeks)		Birth weight (g)		Male
	Heliox	Standard air	Heliox	Standard air	Heliox	Standard air	Heliox	Standard air
Li et al. 2014	19	17	34.2 ± 1.8	34.3 ± 1.8	2150 ± 470	2190 ± 440	13	10
Dani et al. 2013	18	18	25.4 ± 1.5	25.8 ± 1.9	680 ± 150	750 ± 190	10	7
Colnaghi et al. 2012	27	24	30.6 ± 1.4	30.6 ± 1.2	1454.0 ± 332.2	1430.3 ± 327.4	18	15