TABLE 3

Definition of Primary Outcomes

VariableDefinition
Perinatal mortalityDeaths during the perinatal period (surrounding birth), including stillbirths of viable fetuses with gestational age beyond 22 wk or birth weight >500 g and neonatal deaths occurring within the first 7 d of life.
StillbirthBirth of a viable fetus with gestational age beyond 22 wk or birth weight >500 g, an Apgar score of 0 at 1 and 5 min.
Antepartum stillbirthBirth of a viable fetus with gestational age beyond 22 wk or birth weight >500 g, an Apgar score of 0 at 1 and 5 min, signs of maceration, and no fetal heart sound at admission or at the onset of labor.
Intrapartum stillbirthBirth of a viable fetus with gestational age beyond 22 wk or birth weight >500 g, an Apgar score of 0 at 1 and 5 min, with no signs of maceration and who had fetal heart sound at admission and at the onset of labor.
First-day neonatal mortalityDeath of a live-born infant within 24 h of birth.