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当一种新避孕方法发展到临床试用阶段时,有必要与已经确定正在应用着的方法进行比较性研究。作者在芬兰和巴西的三个门诊所研究了三种IUDs,其中二种为新发展的释放左旋18-甲基炔诺酮(Levonorgestrel)IUDs(A 种每日释放18-甲基炔诺酮20μg,B 种每日释放30μg,另一种为释放铜的 Nova-T IUD。选择自愿接受 IUD 的对象,用双盲法,于月经周期的第3～7天放置 IUD,放入 IUD 后,不要附加避孕药,于3、6,12和24月进行随访。自愿放置 IUD 的对象,须具备以下标准:1.便于定期随访,2.至少有一次妊娠史,3.年龄在18～38岁,4.没有妊娠或哺乳史,5.
When a new contraceptive method is developed to the clinical trial phase, it is necessary to conduct a comparative study with methods that have been determined to be applied. The authors studied three IUDs at three outpatient clinics in Finland and Brazil, two of which were newly developed Levonorgestrel IUDs (A daily release of 20 μg of 18-norgestrel , B release of 30μg daily and the other for the release of copper Nova-T IUD. Select the object of voluntary IUD, double-blind method, IUD placed in the first 3 to 7 days of the menstrual cycle, after IUD, do not Additional contraceptives are followed up at months 3, 6, 12 and 24. Patients who voluntarily place an IUD must have the following criteria: 1. To facilitate regular follow-up, 2. At least one pregnancy history, 3. Age 18-38, 4. No history of pregnancy or lactation, 5.