Conclusion Caesarean section for first live birth is associated with a 47% increased risk of placenta praevia and 40% increased risk of placental abruption in second pregnancy with a singleton.

• 结论：首次分娩采用剖宫产女性在第二次怀孕（单胎）发生前置胎盘和胎盘早剥风险分别增加了47%25、40%25。