The study was retrospective and looked at deliveries after September 11, 2001, up to the end of 2010, who had exposure to 9/11.
Subjects were identified through the World Trade Center Health Registry and included women who were engaged in rescue or recovery work, witness to an event, living or working in area.
Researchers examined information on birth certificates to identify low birth weight, preterm delivery, and small for gestational age.
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