Method Retrospective materials research, compared with the 714 cases of uterogestation at the same period.
方法采用回顾性分析方法，与同期足月妊娠714例作对照并进行统计分析。
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Results The C-sect rate of post-term pregnancy is 1.6 times of uterogestation, postpartum hemorrhage is 3.3 times of controls, neonatal asphyxia and newborn meconium inhalation rate will increase.