Delivery and infant details
blood loss, PPH
PRETERM BIRTH, BLOOD LOSS
Gestational age at birth and mode of delivery were collected by a research nurse/midwife from participants’ medical records. Preterm birth was defined as delivery before 37 weeks’ completed gestation. Mode of delivery was categorized as spontaneous vaginal delivery (SVD), instrumental vaginal delivery (i.e. forceps and/or vacuum extraction) or Caesarean section (emergency or elective). When a woman started labour spontaneously before the date of a planned Caesarean section and still delivered by Caesarean section, this was categorized as an elective Caesarean. Since delivery mode is associated with differences in blood loss, estimated blood loss (EBL) was extracted from the medical records; PPH was defined as an EBL ≥ 500 ml, with major PPH as ≥1000 ml.