Classifiction and heterogeneity of preterm birth part 6

Preterm birth 5


Birth at 28-31 weeks gestation is defined as very preterm and accounts for less than 1% of all deliveries and about 10% of preterm births. Immediate survival is expected with a significant proportion of short to long-term morbidity. Below 28 weeks is regarded as extremely preterm (less than 5% of all preterm births) where early neonatal mortality is high with up to 50% of severe handicaps occuring among survivors born below 26 weeks. Recent reports described survival rates  among extremely low gestational ages (24-25 weeks) according to obstetrical variables at admission.

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