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为了探讨大城市非意愿／非计划妊娠发生情况，采用以医院为基础的描述性流行病学方法，于１９９６年８月至１９９６年９月，在北京市５所大医院产前检查门诊共调查了１０１８名孕妇。结果表明，９８．４％（１００２名）孕妇从未生育过。平均结婚年龄为２４．９岁，平均结婚年限为２．４年。曾经使用过某种避孕方法者占８３．０％（８３２名）。以前有过非意愿妊娠（人工流产史）的占４６．２％（４７０名），其中，有过２次人流史者占２０．０％，有过３次及以上者占６．２％。当发现本次妊娠时，３９．６％（４０３名）孕妇并没有打算马上怀孕。２７．４％（２７９名）的孕妇但愿此次妊娠较晚些时侯发生。本次妊娠是避孕失败造成的占１４．６％（１４９名），其中，６０．４％（９０名）妇女事后能很快清楚地意识到自己避孕失败。最常见的失败类型是安全期失败占４１．６％，其次是避孕套失败占１９．５％（２９名）。说明即使在目前参加产前保健孕妇中，有近一半人有过非意愿妊娠，有近２／５的人并没有打算马上怀孕，这说明未生育人群中有较高的非意愿妊娠与非计划妊娠发生率。因此，如何有效地预防非意愿／非计划妊娠是进一步推行晚育，促进城市计划生育工作更加深入开展的重要一环。
In order to investigate the occurrence of unplanned / unplanned pregnancies in big cities, a hospital-based descriptive epidemiological method was used. From August 1996 to September 1996, a total of 5 outpatient clinics were surveyed in Beijing 1018 pregnant women. The results showed that 98.4% (1002) pregnant women had never given birth. The average age of marriage is 24.9 years and the average age of marriage is 2.4 years. 83.0% (832) of those who used certain contraceptive methods. 46.2% (470) had previously had unwanted pregnancies (abortion history), of whom 20.0% had two abortion history and 6.2% had three or more abortions. When this pregnancy was found, 39.6% (403) pregnant women did not intend to be pregnant immediately. 27.4% (279) of pregnant women hope this later pregnancy occurs. This pregnancy is the result of contraceptive failure accounted for 14.6% (149), of which 60.4% (90 women) quickly and clearly aware of their own contraceptive failure. The most common type of failure was failure of the safety period 41.6%, followed by condom failure 19.5% (29). Indicating that nearly half of unwed pregnant pregnancies currently participate in prenatal care, and nearly two-fifths did not intend to become pregnant immediately, suggesting that unintended pregnancies and unplanned pregnancies are high among unaffiliated people The incidence of pregnancy. Therefore, how to effectively prevent unwilling / unplanned pregnancies is an important part of further promoting late childbirth and promoting urban family planning more deeply.