Table 3 Results of univariate analysis for the risks of BPD

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.