Do Probiotics Reduce The Risk Of Severe Necrotising Enterocolitis (NEC) In Infants Born Before 32 Weeks Gestation?

Exclusion Criteria

• •They have missing data for any of: gestational age at birth, birth weight, year of birth and date of death (for those that died).
• •Their NNRD record does not include details of their first admission or begins after Day 3 of life.
• •The absolute value of their recorded birthweight for gestational age z score exceeds 4 or is missing.
• •They die in the first two postnatal days of life.
• •They have a major congenital abnormality