[Retracted] Profound Effect of Pulmonary Surfactant on the Treatment of Preterm Infants with Respiratory Distress Syndrome

Table 2

Basic information of respondents.

Parameters	Number of cases
	90
	Male	Female
	43	47
Gestational age	29.5–34 2 w	30.0–35.2 w
Body weight	0.90–2.20 kg	1.20–2.3 kg