[Analysis of 106,272 cases of postterm pregnancy in China].

106272 cases of postterm pregnancy in 945 hospitals in China during the period from Oct. 1986 to Sept. 1987 were surveyed, the overall incidence rate was 85.48/1000. Provincially, the highest two rates were 127.36/1000 and 120.92/1000 in Jilin and Shandong provinces respectively, and the lowest two rates 53.98/1000 and 61.38/1000 in Xizang and Qinghai provinces respectively. The perinatal mortality was 27.90/1000 (corrected 12.49/1000). The incidence of macrosomia (89.50/1000) in postterm pregnancy was twice as much as that in term delivery. Postterm pregnancy was more frequent in pregnant women of 20-34 years old,and of 42 weeks' gestation. The incidence malformations in postterm pregnancy was 154.13 per ten thousand, in which the frequency of malformations associated with low birth weight was three times that associated with macrosomia.