Table 1.
Placental characteristics of singleton stillbirths and live births from the Stillbirth Collaborative Research Network Study (2006-2008) using the weighted sample.
| Characteristic | Stillbirths %w | Live births %w |
|---|---|---|
| N=266 | N=1135 | |
| Nw=262 | Nw=915 | |
| Developmental Disorders | ||
| Any Developmental Disorder | 20.3 | 11.0 |
| Umbilical cord | ||
| Single umbilical artery | 5.2 | 1.8 |
| Velamentous insertion | 3.2 | 1.1 |
| Furcate insertion | 1.9 | 3.6 |
| Placental Membranes | ||
| Circummarginate insertion | 1.0 | 0.5 |
| Circumvallate insertion | 0.7 | 1.0 |
| Fetal villous capillaries | ||
| Terminal villous immaturity (diffuse) | 8.3 | 2.4 |
| Terminal villous hypoplasia (diffuse) | 3.5 | 1.9 |
| Inflammatory Disorders | ||
| Any Maternal inflammatory response | 34.7 | 15.6 |
| Acute chorioamnionitis - placental membranes | 30.9 | 11.9 |
| Acute chorioamnionitis - chorionic plate | 24.0 | 11.9 |
| Any Fetal inflammatory response | 13.9 | 8.5 |
| Acute funisitis | 11.6 | 3.4 |
| Acute umbilical cord arteritis (≥1 artery) | 4.2 | 1.8 |
| Acute umbilical cord phlebitis | 5.4 | 3.0 |
| Chorionic plate acute vasculitis | 7.2 | 4.9 |
| Circulatory Disorders | ||
| Any Maternal circulatory disorder | 58.8 | 29.6 |
| Retroplacental hematoma | 27.5 | 4.2 |
| Parenchymal infarction | 29.6 | 15.8 |
| Intraparenchymal thrombus | 18.4 | 13.6 |
| Perivillous, intervillous fibrin, fibrinoid deposition | 7.9 | 1.5 |
| Any Fetal circulatory disorder | 41.5 | 14.5 |
| Fetal vascular thrombi in the chorionic plate | 24.4 | 7.3 |
| Avascular villi | 19.4 | 6.9 |
| Placental edema | 5.3 | 1.1 |
Abbreviations: Nw – weighted sample size; %w – weighted percent