Risk factors* | ≤750 g | 751–1000 g | 1001–1250 g | >1250 g |
---|---|---|---|---|
Number of infants | 665 | 748 | 813 | 834 |
Apgar score 5 min | 6 (3) | 7 (2) | 7 (2) | 8 (2) |
Gender, male (%) | 41.5 | 52.0 | 51.0 | 49.3 |
Race, AA (%) | 80.5 | 83.4 | 79.1 | 79.5 |
Birth weight (g) | 626 (137) | 877 (133) | 1128 (131) | 1381 (114) |
Gestational age (weeks) | 25 (2) | 27 (2) | 29 (3) | 31 (3) |
Small for gestational age (%) | 55.3 | 39.0 | 30.3 | 27.6 |
Umbilical artery catheter days | 10 (12) | 5 (9) | 0 (5) | 0 (0) |
Days on ventilator | 21 (28) | 6 (16) | 1 (4) | 0 (1) |
Treatment for PDA (%) | 50.5 | 37.7 | 13.2 | 3.6 |
Number of transfusions | 12 (9) | 5 (5) | 2 (3) | 1 (2) |
Exposure to blood transfusion (%) | 93.5 | 84.8 | 51.0 | 20.5 |
NEC (%) | 7.7 | 6.8 | 5.7 | 3.0 |
*Presented as the percentage of the number of infants or as median (IQR).
AA, African-American; NEC, necrotising enterocolitis; PDA, patent ductus arteriosus.