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The study was based on a survey of a random sample of 8,074 new mothers in Maryland who delivered babies between 2004 and 2008. Participants completed the survey between 2 and 9 months after delivery.
More information on postpartum depression is posted at http://pn.psychiatryonline.org/content/45/18/18.1.full and http://pn.psychiatryonline.org/content/42/13/1.1.full