Primary outcomes.

aValues adjusted for maternal SES, BMI, and indication for previous caesarean birth.bDeath or serious outcome includes: death (any fetal death after study entry or death of a liveborn infant prior to hospital discharge [excluding lethal congenital anomalies]); or serious neonatal morbidity (defined as one or more of: birth trauma [subdural or intracerebral haemorrhage, spinal cord injury, basal skull fracture, other fracture, peripheral nerve injury present at discharge from hospital]; seizures at 4 d; severe neonatal lung disease [defined as MAP>10 and or FiO2>0·80 with need for ventilation]; proven necrotising enterocolitis; or proven systemic infection in first 48 h of life treated with antibiotics).NICU, neonatal intensive care unit.