In this project, Savitz will analyze data from the Statewide Planning and Research Cooperative System (SPARCS), which covers all hospitalizations in New York State. By linking delivery and depression hospital-discharge records, he can estimate the prevalence and incidence of severe postpartum depression on more than 1.1 million births. Savitz and his collaborators will address demographic, social, and medical predictors of postpartum depression, and evaluate the relationship with infant health measures and pregnancy complications.