| Number of patients |
137 |
94 |
|
| Birth weight, g |
1316.9 ± 184.6 |
1539.6 ± 172.6 |
<0.00001 |
| Gestational age, weeks |
30(29–31) |
31(31–32) |
<0.0001 |
| Intra-uterine growth restriction |
37 (27.0%) |
30 (31.9%) |
0.42 |
| Male |
80 (58.4%) |
49 (52.1%) |
0.35 |
| Apgar score at 1 min |
7(5–8) |
8(6–8) |
0.24 |
| Apgar score at 5 min |
8(6–9) |
8(7–8) |
0.87 |
| Apgar score at 10 min |
8(7–9) |
8(8–8) |
0.84 |
| Vaginal delivery |
40 (29.2%) |
33 (35.1%) |
0.34 |
| Prenatal steroids |
112 (81.8%) |
81 (86.2%) |
0.37 |
| Maternal pregnancy-induced hypertension |
35 (25.5%) |
31 (33.0%) |
0.22 |
| Maternal diabetes |
5 (3.6%) |
2 (2.1%) |
0.51 |
| Chorioamnionitis |
18 (13.1%) |
9 (9.6%) |
0.41 |
| Premature rupture of membranes |
40 (31.9%) |
32 (34.0%) |
0.44 |
| Cord blood pH |
7.29 ± 0.06 |
7.29 ± 0.07 |
1.0 |
| Ureaplasma urealyticum positive in urine |
14 (10.2%) |
12 (12.8%) |
0.55 |
| Surfactant |
107 (78.1%) |
47 (50.0%) |
<0.0001 |
| Aminophylline |
100 (73.0%) |
30 (31.9%) |
<0.0001 |
| Mechanical ventilation ≥ 1 week |
24 (17.5%) |
5 (5.3%) |
0.009 |
| Nasal continuous positive airway pressure ≥ 1 week |
12 (8.8%) |
7 (7.4%) |
0.72 |
| Pneumonia |
17 (12.4%) |
8 (8.5%) |
0.35 |
| Sepsis |
48 (35.0%) |
24 (25.5%) |
0.13 |
| Patent ductus arteriosus |
18 (13.1%) |
8 (8.5%) |
0.28 |
| Ibuprofen for patent ductus arteriosus |
7 (5.1%) |
0 (0.0%) |
0.10 |
| Patent ductus arteriosus ligation |
1 (0.7%) |
0 (0.0%) |
0.66 |
| Necrotizing enterocolitis |
34 (24.8%) |
6 (6.4%) |
0.0007 |
| Bronchopulmonary dysplasia |
51 (37.2%) |
2 (2.1%) |
<0.00001 |
| Mild |
36 (26.3%) |
2 (2.1%) |
0.0002 |
| Moderate/severe |
15 (10.9%) |
0 (0.0%) |
0.03 |
| Length of hospital stay, weeks |
43.3 ± 8.2 |
34.7 ± 4.0 |
<0.00001 |
| Patients discharged alive |
133 (97.1%) |
94 (100.0%) |
0.22 |
