BPD group

(n = 37)

Non-BPD group

(n = 175)

t value

χ2

P

GA at birth (wk)

29.0 ± 1.1

31.1 ± 2.0

9.081

<0.001

Birth weight (g)

1205.8 ± 179.0

1292.6 ± 150.7

2.748

0.008

1-min Apgar score

5.9 ± 2.0

6.8 ± 1.7

2.824

0.005

5-min Apgar score

7.4 ± 2.1

8.6 ± 1.2

3.235

0.002

Paternal age (yr)

34.4 ± 5.8

32.4 ± 5.8

1.834

0.068

Maternal age (yr)

30.8 ± 4.4

29.4 ± 4.9

1.688

0.093

Length of hospital stay (d)

67.7 ± 20.9

43.1 ± 14.6

6.801

<0.001

Male (%)

68% (25/37)

51% (89/175)

3.431

0.064

Small for gestational age (%)

8% (3/37)

42% (73/175)

14.99

<0.001

Assisted reproduction (%)

27% (10/37)

26% (45/175)

0.027

0.869

Fetal distress (%)

16% (6/37)

27% (48/175)

2.023

0.155

PROM (%)

54% (20/37)

43% (75/175)

1.548

0.213

Blood-stained amniotic fluid (%)

13% (4/31)

2% (3/166)

6.426

0.011a

Placenta previa/placental abruption (%)

29% (8/28)

13% (17/135)

3.412

0.065a

Umbilical cord abnormality (%)

19% (5/26)

14% (20/138)

0.102

0.750a

UU infection (%)

0% (0/37)

2% (3/175)

0.643

1.000b

Gestational diabetes (%)

16% (6/37)

17% (30/175)

0.019

0.892

Hypertensive disorders of pregnancy (%)

16% (6/37)

33% (57/175)

3.912

0.048

Thyroid dysfunction in pregnancy (%)

11% (4/37)

7% (12/175)

0.235

0.628a

Intrahepatic cholestasis of pregnancy (%)

0% (0/37)

3% (6/175)

0.356

0.550a

Prenatal GC (%)

62% (21/34)

56% (84/149)

0.329

0.556

NRDS (%)

89% (33/37)

34% (60/175)

37.389

<0.001

Neonatal pneumonia (%)

95% (35/37)

58% (102/175)

17.612

<0.001

Positive sputum bacterial culture (%)

32% (12/37)

8% (14/175)

14.750

<0.001a

Pulmonary hemorrhage (%)

11% (4/37)

1% (2/175)

7.163

0.007a

Apnea (%)

81% (30/37)

51% (90/175)

10.933

0.001

Respiratory failure (%)

54% (20/37)

13% (22/175)

33.083

<0.001

Sepsis (%)

40% (15/37)

22% (38/175)

5.773

0.016

Thrombocytopenia (%)

30% (11/37)

26% (46/175)

0.184

0.668

NEC (%)

0% (0/37)

3% (5/175)

1.083

0.590b

PDA (%)

11% (4/37)

6% (11/175)

0.378

0.534

Use of PS (%)

81% (30/37)

35% (62/175)

25.914

<0.001