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YD Yi Dai
LZ Li Zhu
YZ Yequn Zhou
CC Chao Chen
SZ Shulian Zhang
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Gestational age was defined, in descending order of preference, from the early prenatal ultrasound result, last menstrual period, or New Ballard Score (18). Small for gestational age (SGA) was defined as birth weight (BW) less than the 10th percentile according to Zhu et al. (19). Antenatal steroid use was defined as any administration prior to birth, regardless of the time interval. Prolonged mechanical ventilation (MV) was defined as >7 days of invasive ventilation.

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