| 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 |