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美国1972年对 F-Cu380A 的临床研究表明,此器的避孕效果显著高于 T-Cu200。巴西于1979～1980年开展了对 T-Cu380k 随机抽样的临床研究,并与利比氏曲进行了对比观察。所有参加这项研究的志愿者至少生育一次,无异位妊娠史,无盆器炎,经临床及妇科检查认为身体健康。共328名分为两组,第一组159人,安放 T-Cu380A;第二组169人,安放利比氏曲。两组的放置都是由经过训练的妇科学家、住院医师或登记的助产士完成。于
The United States in 1972 on the F-Cu380A clinical studies have shown that this device contraceptive effect was significantly higher than the T-Cu200. Brazil from 1979 to 1980 to carry out a randomized clinical trial of T-Cu380k, and compared with the ribitolol were observed. All volunteers who participated in this study had at least one childbirth, no history of ectopic pregnancy, no pelvic inflammatory disease and were considered as good by clinical and gynecological examinations. A total of 328 were divided into two groups, the first group of 159 people, placed T-Cu380A; the second group of 169 people, placed Liby song. The placement of both groups is done by a trained gynecologist, resident or registered midwife. in