Characteristics of mothers and infants in the main cohort.

Data are for singleton or twin liveborn infant who survived 28 days or more after birth, according to World region of origin. All data are presented as a number (percent) unless otherwise indicated. Any cell size “≤5” is suppressed.*Preeclampsia or eclampsia, gestational hypertension, placental abruption and/or placental infarction.†Comprises all of Europe, the UK, Wales, Scotland and Ireland, Australia and New Zealand, and the US.IQR Interquartile range.