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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Obstet Gynecol. 2014 Jan;123(1):113–125. doi: 10.1097/AOG.0000000000000052

Figure 1.

Figure 1

Cotinine and toxicology analyses comparing results from stillbirth and live birth pregnancies. The Stillbirth Collaborative Research Network stillbirth case status (SCRN case status) is defined as follows. A pregnancy is categorized as a stillbirth pregnancy if there are any stillbirths delivered and as a live birth pregnancy if all live births are delivered. A fetal death is defined by Apgar scores of 0 at 1–5 minutes and no signs of life by direct observation. Fetal deaths are classified as stillbirths if the best clinical estimate of gestational age at death is 20 or more weeks. Fetal deaths at 18–19 weeks without good dating are also included as stillbirths.