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采用二种释放铜的宫内节育器(IUD);N-ovaT和Tcu200。二者铜表面积均为200mm~2,铜丝外径均为0.3mm,并配以0.1mm直径的银轴心。从1975年11月至1977年3月在丹麦、芬兰和瑞典6个临床单位,按预先随意排列次序在1893名妇女中放置了IUD。资料分析时可采用的随访资料为1865例。其中月经后放置1529例,合法流产后立即放置336例。放置条件是无可疑妊娠,身体健康,既往盆器炎及宫外孕史妇女未被排除,参加研究病历
Two copper-releasing IUDs; N-ovaT and Tcu200 were used. Both copper surface area is 200mm ~ 2, copper wire diameter are 0.3mm, and with a diameter of 0.1mm silver axis. From November 1975 to March 1977 in 6 clinical units in Denmark, Finland and Sweden, IUDs were placed in 1893 women in a prearranged order. Data analysis can be used when the follow-up data for 1865 cases. Among them, 1529 cases were placed after menstruation and 336 cases were placed immediately after legal abortion. Placement conditions are no suspicious pregnancy, good health, past history of pelvic inflammatory disease and ectopic pregnancy women have not been excluded, to participate in research medical records