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Maternal stress and depression pose risks for preterm delivery. Investigators based at the Veterans Administration used the electronic medical record and data from the compulsory assessment of post-traumatic stress disorder (PTSD) in military personnel to evaluate the association between active PTSD (within 1 year of delivery) or historical PTSD (prior diagnosis) and risk for preterm birth. Among >16,000 deliveries, 19% were to women with PTSD (including 12% with active PTSD). Risk for spontaneous preterm delivery was higher among women with active PTSD (9%) than those with historical PTSD (8%) or no PTSD (7%), and the excess risk persisted after adjustment for potential confounders. Most women with active PTSD had experienced military sexu…