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１９８６年１０月至１９８７年９月中国９４５所医院过期妊娠１０６２７２例，平均发生率为８５．４８‰，吉林省和山东省最高，分别为１２７．３６‰、１２０．９２‰，西藏自治区和青海省最低，分别为５３．９８‰、６１．３８‰。过期妊娠围产儿死亡率为２７．９０‰，足月妊娠围产儿死亡率为１６．２９‰。过期妊娠围产儿中的巨大儿发生率为８９．５０‰，为足月妊娠围产儿的２倍。过期妊娠以２０～３４岁的孕妇多见，主要分布在孕４２周。围产儿畸形率为１５４．１３／万，其中低体重围产儿的畸形率为巨大儿的３倍。
From October 1986 to September 1987, there were 106,272 cases of pregnancy in 945 hospitals in China with an average incidence of 85.48 ‰, with the highest in Jilin Province and Shandong Province, 127.36 ‰ and 120.92 ‰, respectively. Tibet Autonomous Region and Qinghai Province The lowest in the province was 53.98 ‰ and 61.38 ‰, respectively. The perinatal mortality rate of overdue pregnancy was 27.90 ‰, and the perinatal mortality rate of full-term pregnancy was 16.29 ‰. The incidence of macrosomia in perinatal fetus of overdue pregnancies is 89.50 ‰, which is twice as high as that of term infants. Overdue pregnancy to 20 to 34-year-old pregnant women more common, mainly in the pregnant 42 weeks. Perinatal malformation rate of 154.13 / million, of which low birth weight infants perinatal rate of 3 times the giant children.