Patient characteristics
| Gestational age (weeks) | n | Birth weight (g)* | Male n (%) | Caesarean section n (%) | Apgar score* at 1 min/5 min | Cord vein pH* | SGA† n (%) | Infants with asphyxia‡ n (%) | Ventilation support n (%) |
|---|---|---|---|---|---|---|---|---|---|
| *Expressed as medians (range); †SGA, small for gestational age (<−2.0 SD gestational age adjusted mean birth weight15); ‡asphyxia defined as venous cord blood pH <7.26 or Apgar score <7 at 5 minutes. | |||||||||
| 24–27 | 21 | 790 (515–1180) | 15 (71) | 16 (76) | 6 (2–9)/8 (3–9) | 7.31 (7.02–7.43) | 9 (43) | 8 (38) | 21 (100) |
| 28–30 | 25 | 1150 (770–1850) | 10 (40) | 19 (76) | 7 (2–9)/8 (2–9) | 7.30 (6.90–7.50) | 7 (28) | 9 (36) | 23 (92) |
| 31–33 | 34 | 1820 (1140–2710) | 21 (62) | 28 (82) | 8 (3–9)/9 (6–10) | 7.31 (7.08–7.48) | 10 (30) | 7 (20) | 17 (50) |
| 34–36 | 45 | 2460 (1670–3740) | 25 (56) | 29 (64) | 9 (0–9)/8 (4–10) | 7.32 (6.89–7.48) | 13 (29) | 10 (22) | 17 (38) |