Table 1. Perinatal and family history of enrolled infants.
| Parameters | All infants* (n = 1,140) | Infants with BPD (n = 326) | Infants without BPD (n = 806) |
|---|---|---|---|
| Gestational age (week) | 30+5 ± 25/7 | 27+6 ± 2+3 | 31+5 ± 1+6 |
| Birth weight (g) | 1,502 ± 474 | 1,069 ± 324 | 1,678 ± 407 |
| Male | 54.5 (621/1,140) | 54.6 (178/326) | 54.5 (439/806) |
| Multiple pregnancy | 31.4 (358/1,140) | 32.5 (106/326) | 30.8 (248/806) |
| Stay at NICU (day) | 49.3 ± 34.3 | 84.2 ± 36.1 | 35.5 ± 20.9 |
| Antenatal corticosteroid | 67.8 (736/1,086) | 75.6 (232/307) | 65.0 (502/772) |
| Caesarian section | 70.0 (798/1,139) | 72.7 (237/326) | 69.1 (556/805) |
| SGA | 10.1 (115/1,137) | 10.8 (35/325) | 9.8 (79/804) |
| Maternal age (yr) | 32.6 ± 4.0 | 33.2 ± 3.7 | 32.4 ± 4.1 |
| Elder siblings | 42.4 (466/1,099) | 42.3 (133/314) | 42.6 (331/777) |
Values are mean±standard deviation or % (No./total No.). *Includes eight infants whose data on BPD were unavailable. BPD, bronchopulmonary dysplasia; SGA, small for gestational age; C/S, caesarian section; NICU, neonatal intensive care unit.