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Across cultures, postpartum psychosis is estimated to occur in 1–2/1000 postpartum women. These investigators used Swedish registry data to examine whether postpartum psychosis occurs de novo or is associated with a history of psychiatric hospitalization. The study population was 612,306 women who gave birth to a live first child between 1987 and 2001.
The incidence of hospitalization for psychosis or bipolar disorder within 90 days of childbirth was 0.10% (0.07% for psychosis, 0.03% for bipolar disorder). Incidence of postpartum hospitalization was 0.04% for psychosis and 0.01% for bipolar disorder in women with no previous psychiatric hospitalizations and 9.24% and 4.48% in women with such hospitalizations. More than 40% of women hospitali…