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Table 2 Key definitions for outcome measures

From: Antiplatelet agents for prevention of pre-eclampsia and its consequences: a systematic review and individual patient data meta-analysis

Main outcomes

Definition

pre-eclampsia

as defined in Table 1

pregnancy loss / neonatal death

miscarriage, fetal death or death of a liveborn infant before hospital discharge

pre-term birth

pre-term birth: ≤ 37 weeks + 6 days of gestation moderately pre-term birth: ≤ 33 weeks + 6 days of gestation extremely pre-term birth: ≤ 27 weeks + 6 days of gestation

small for gestational age (SGA) infant

infant with birth-weight below the 3rd centile, or as defined in the individual trial

pregnancy with serious adverse outcome

pregnancy with any of the above main outcomes for the woman or any fetus/baby, or the death of the woman. If sufficient data available, severe maternal morbidity will also be included in this definition.

Other outcomes

Definition

early onset pre-eclampsia

as defined in Table 1

maternal death

death during pregnancy or up to 42 days after termination of the pregnancy

antepartum haemorrhage

any vaginal bleeding before the onset of labour

placental abruption

clear evidence of placental separation

severe maternal morbidity

including eclampsia, HELLP syndrome, DIC, pulmonary oedema, liver failure, renal failure or CVA/stroke

infant death

live born and any reported death from 29 days to 1 year of life or after hospital discharge

neonatal bleeding

abnormal bleeding in the neonatal period including periventricular haemorrhage, gastrointestinal, umbilical or other sites