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Characteristics of preterm and very low birth weight (VLBW) infants in the study cohort
| Preterm (≤30 weeks) | VLBW (<1500 g) | |
| n = 3119 | n = 3409 | |
| Males (%) | 56 | 53 |
| Multiple births (%) | 27 | 29 |
| Cesarean section (%) | 46 | 51 |
| Antenatal steroids (%) | 72 | 70 |
| Outborn (%) | 22 | 21 |
| Small for gestational age 3 rd percentile (%) | 14.7 | 26.1 |
| Mean birth weight (grams) | 1071 | 1041 |
| Mean gestational age (weeks) | 27 | 28 |
