Table 2 Rates of key in‐hospital outcomes, stratified by gestational age and birth weight.
| Gestational age (weeks) | Birth weight (g) | All infants (n = 1250) | |||
|---|---|---|---|---|---|
| 30–326/7 (n = 476) | 33–346/7 (n = 774) | <2000 (n = 731) | ⩾2000 (n = 519) | ||
| LOAV ⩾72 hours | 21.3 | 3.4* | 14.0 | 4.8* | 10.2 |
| Pneumothorax | 1.3 | 1.7 | 1.5 | 1.6 | 1.6 |
| Oxygen in use at 28 days | 7.1 | 0.1* | 4.8 | 0.0* | 2.8 |
| Oxygen in use at 36 weeks PMA | 6.7 | 1.0* | 4.3 | 1.5* | 3.2 |
| Necrotising enterocolitis | 1.2 | 0.7 | 1.0 | 0.8 | 0.9 |
| Sepsis/meningitis | 4.9 | 0.8* | 3.1 | 1.4 | 2.4 |
| IVH, any | 0.6 | 0.0 | 0.4 | 0.0 | 0.2 |
| IVH, grade 3 or 4 | 1.2 | 0.0* | 0.8 | 0.0 | 0.4 |
| Retinopathy of prematurity | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Discharge at <36 weeks PMA | 45.7 | 53.9 | 45.2 | 58.7* | 50.8 |
| Discharge at 36–38 weeks PMA | 41.6 | 38.6 | 43.8 | 34.0 | 39.8 |
| Discharge at ⩾38 weeks PMA | 12.7 | 7.4 | 11.0 | 7.2 | 9.4 |
Values are percentages. Statistical comparisons are between 30–326/7 week infants and 33–346/7 week infants and between infants <2000 g and infants ⩾2000 g birth weight. Asterisks indicate comparisons that reached significance at the p<0.05 level.
LOAV, Length of assisted ventilation; IVH, intraventricular haemorrhage; PMA, postmenstrual age.