Abstract
To systematically evaluate the risk factors of postpartum hemorrhage, the Chinese and English databases were searched by computer system, and the case-control studies on postpartum hemorrhage were found up to March 2022, Meta-analysis was performed with RevMan 5.4 after literature screening and quality evaluation. A total of 34 articles were included, and the statistically significant risk factors were cesarean delivery OR=6.08(3.67-10.08), anterior placenta OR=5.98(4.56-7.84), weak uterine contractions OR=5.41(4.37-6.70), placenta adhesion OR=3.75(2.89-4.86), hypertension during pregnancy OR=2.89(2.09-4.01), multifetal pregnancy OR=2.49(1.99-3.12), history of miscarriage OR=1.90(1.57-2.29) and giant baby OR=1.82(1.64-2.02). Cesarean delivery, anterior placenta, weak uterine contractions, placenta adhesion, hypertension during pregnancy, multifetal pregnancy, history of miscarriage and giant baby are the risk factors of postpartum hemorrhage.
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