Table 1. Perinatal population characteristics.
| Characteristics | Infants 24–29 weeks’ GA admitted to an NICU n = 3917 | |
|---|---|---|
| Gestational age (weeks). mean (SD) | 27.1 (1.6) | |
| Birth weight (g). mean (SD) | 1105 (278) | |
| Gestational age | ||
| 24–25 weeks | 748 | (19.1) |
| 26–27 weeks | 1276 | (32.6) |
| 28–29 weeks | 1896 | (48.4) |
| Male gender | 2139 | (54.6) |
| Multiples | 1173 | (29.9) |
| Birth weight percentile | ||
| SGA <10th | 363 | (9.3) |
| 10-25th | 614 | (15.7) |
| >25th | 2940 | (75.1) |
| Preeclampsia/eclampsia/HELLP | 558/3871 | (14.4) |
| PROM | 981/3859 | (25.4) |
| Caesarean section | 2551/3892 | (65.5) |
| Inborn | 3456/3911 | (88.4) |
| Apgar <7 at 5 min | 837/3644 | (23.0) |
| Antenatal steroids | 3465/3884 | (89.2) |
| Surfactant | 2983/3910 | (76.3) |
| Mechanical ventilation | 3030/3907 | (77.6) |
| NSAIDs to treat PDA | 1110/3899 | (28.5) |
| PNC | 545 | (13.9) |
Data are no. (%) unless indicated and for 3917 infants unless indicated.
GA, gestational age; HELLP: Hemolysis Elevated Liver enzyme Low Platelet NICU, neonatal intensive care unit; PNC, postnatal steroids; SGA, small for gestational age; PROM, premature rupture of membrane; NSAIDs, non-steroidal anti-inflammatory drugs; PDA, persistant ductus arteriosus