Figure 1.

This analysis compares placental examination results for subgroups of singleton stillbirth and live birth pregnancies, with particular focus on PE/GH. A pregnancy was categorized as a stillbirth pregnancy if there were any stillbirths delivered and as a live birth pregnancy if all live births were delivered. A fetal death was defined by Apgar scores of 0 at 1 and 5 minutes and no signs of life by direct observation. Fetal deaths were classified as stillbirths if the best clinical estimate of gestational age at death was 20 or more weeks. Fetal deaths at 18 and 19 weeks without good dating were also included as stillbirths.

* A placenta examination was deemed inadequate for this analysis if conducted by a pathologist other than those trained to follow the Stillbirth Collaborative Research Network placental exam protocol or if only slides were available for review. Mummified stillborn fetuses were those with Grade IV-V maceration among fragmented fetuses and Grade V maceration among intact fetuses. Two stillborn fetuses were both fragmented and macerated.