RHD and spontaneous abortion: The rates of miscarriage (22.1 per 1,000 pregnancies vs. 4.5 per 1,000 pregnancies), stillbirth (33.8 per 1,000 pregnancies vs. 6.7 per 1,000 pregnancies), and neonatal death (35.0 vs. 16.6 per 1,000 live births) were higher among Rh(D)-negative vs. Rh(D)-positive participants.