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Table 3 Results of univariate analysis for the risks of BPD

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

  With BPD (n = 49) Without BPD (n = 24) P value
Maternal age (years) 32.2 ± 5.4 33.4 ± 4.8 n.s.
Primiparity 18 (36.7%) 13(54.1%) n.s.
Delivery by caesarean section 36(73.5%) 20 (83.3%) n.s.
Administration of corticosteroid 41 (83.7%) 18 (75%) n.s.
Gestational age at PROM (weeks) 23.9 ± 1.7 25.6 ± 1.7 < 0.05
Gestational age at delivery (weeks) 26.6 ± 2.9 27.6 ± 3.3 n.s.
Delivery at less than 37 weeks of gestation 49(100%) 23(95.8%) n.s.
 34weeks 1 1 n.s.
30-33weeks 5 3 n.s.
26-29weeks 18 13 n.s.
22-25weeks 26 6 < 0.05
Days form PROM to delivery (days) 18.9 ± 18.8 14.3 ± 23.6 n.s.
Clinical CAM 13 (26.5%) 3 (12.5%) n.s.
aOligohydramnios 45(91.8%) 12(50%) 0.05
Duration of oligohydramnios before delivery (days) 16.7 ± 18.3 2.2 ± 1.6 < 0.05
Birth weight (g) 968 ± 414 1065 ± 533 n.s.
Male sex of the neonate 27(55.1%) 12(50%) n.s.
Small for gestational age (< 10% tile) 2(4.08%) 2(8.3%) n.s.
Use of positive pressure ventilation after birth 46 (93.9%) 21(87.5%) n.s.
Neonatal sepsis 4(8.16%) 2(8.3%) n.s.
CAM stage III in pathologic examination of the placenta 30(61.2%) 14(58.3%) n.s.
  1. Results are expressed as mean ± standard deviation or number (%). Fisher’s extract exact test and t-test were used for two-group comparisonsaOligohydramnios was defined as an amniotic fluid index of ≤ 5 cm on transabdominal ultrasonography.