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Table 1 Patient clinical characteristics.

From: Risk factors for neonatal bronchopulmonary dysplasia in extremely preterm premature rupture of membranes: a retrospective study

  n = 73
Maternal age(years) 32.6 ± 5.2
Primiparity 31 (42.5%)
Delivery by caesarean section 56 (76.7%)
Administration of corticosteroid 59 (80.8%)
Gestational age at PROM (weeks) 24.5 ± 1.9
Gestational age at delivery (weeks) 27.0 ± 3.0
Delivery at less than 37 weeks of gestation 72 (98.6%)
34 weeks 2
30–33 weeks 8
26–29 weeks 31
22–25 weeks 31
Days form PROM to delivery (days) 17.4 ± 20.5
Clinical CAM 16 (21.9%)
aOligohydramnios 57 (78.1%)
bAnhydramnios 24(32.9%)
Duration of oligohydramnios before delivery (days) 17.4 ± 20.5
  1. aOligohydramnios: Oligohydramnios was defined as an amniotic fluid index (AFI) of ≤ 5cm on transabdominal ultrasonography.
  2. bAnhydramnios: Anhydramnios was defined as the complete lack of amniotic fluid on transabdominal ultrasonography.