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宫内节育器(简称IUD)是一种与性生活无关,全身危害极少的长期避孕措施。最初认为避孕效果可达100％,事实上任何一种IUD都还不够理想。妊娠是其重要并发症之一。由于偏见、人群的不同、医生的经验、失访妇女数和观察时间的长短都能影响失败率和最后的结果,因此有必要统一报告方法,使分析数据更有意义。妊娠率有三种计算方法。第一种是最简单的数学方法,统计使用IUD者妊娠的百分数,这样计算的失败率最高,且分析时不考虑有效期的长短,也不纠正中断使用者的怀孕率,所以不能正确反映妊娠与IUD的关系,现已很少使用。第二种Pearl
IUD (IUD) is a kind of long-term contraceptive measures that has nothing to do with sexual life, minimal systemic risk. Initially contraceptive effects of up to 100%, in fact, any kind of IUD are not ideal. Pregnancy is one of its important complications. Because of prejudice, demographic differences, experience of doctors, the number of women lost to follow-up, and the length of observation, the rate of failure and the final outcome can all be affected, making it necessary to harmonize reporting methods to make the analysis more meaningful. There are three methods of calculating pregnancy rates. The first is the simplest mathematical method, the percentage of pregnancies using IUD statistics, so the highest failure rate calculation, and does not consider the analysis of the length of the period, nor to correct the interrupt user’s pregnancy rate, it can not correctly reflect the pregnancy and IUD relationship, now rarely used. The second Pearl