There were 86765 births during our study period,including 83310 singletons,3244 twins and211higher-order multiples.There were 6259 preterm deliveries (4672singletons,1399 twins,and188 higherorder multiples). Amongthose,352 women witha singleton gestation and 79 women with a twin gestation delivered preterm and had a diagnosis of severe preeclampsia as ascertained by diagnosis at delivery, and validated by chart review utilizing American College of Obstetricians and Gynecologists criteria for diagnosis of severe preeclampsia.