This research evaluates the effects of prenatal factors on adverse pregnancy outcomes, the general demographic information, the level of maternal exposure to air pollution, the environmental condition, pregnancy-related information, the occurrence of adverse pregnancy outcomes, and serum indicators of pregnant women during pregnancy are collected. Finally, the research explores that whether prenatal factors including environment can mediate the occurrence of maternal hemorrhage.
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The Influence of Prenatal Factors Including Environment on Maternal Hemorrhage.
Timeframe: Prenatal hemoglobin level: blood hemoglobin level within one week before delivery; Postpartum hemoglobin level: blood hemoglobin level 1 day after delivery