1985年在石河子医学院附属医院门诊调查443例人工流产受术者的术前避孕情况。其中有44%根本未避孕。在避孕者中有19%合用两种或两种以上避孕方法。使用的方法比例依次为口服药、避孕套、外用药膜、IUD等。失败时间:一年内占46%、两年内占72%。除绝育外,IUD节育失败率最低。失败主要原因:采 In 1985 in Shihezi Medical College Hospital outpatient investigation of 443 cases of induced abortion by surgery patients with preoperative contraception. 44% of them did not contraception at all. 19% of contraceptives use two or more methods of contraception. The proportions of the methods used were oral medication, condoms, external application membrane, IUD and the like. Failure time: 46% within a year, 72% within two years. In addition to sterilization, IUD birth control failure rate is the lowest. The main reason for failure: mining