Luukkainen T, Nielsen N C, Nygren K G, Pyörälä T, Allonen H
Contraception. 1979 Jan;19(1):11-20. doi: 10.1016/s0010-7824(79)80004-9.
A randomized comparative study between Nova-T and Copper-T-200 was performed simultaneously in Denmark, Finland and Sweden. The results of 741 postmenstrual insertions with Nova-T and 780 with Copper-T are reported. The pregnancy rate of Nova-T was lower in every age and parity group. The pregnancy rate of Copper-T-200 varied in participating countries, whereas the pregnancy rate of Nova-T was equally low in every country. The termination rate because of expulsion with Nova-T was less affected by age and parity than that of Copper-T. Significant differences in the continuation rates with the same device were found between countries. Removals because of infection showed that women below 25 years of age had a high risk for infection regardless of parity.
在丹麦、芬兰和瑞典同时开展了一项关于诺瓦-T型宫内节育器和铜-T-200型宫内节育器的随机对照研究。报告了741例月经后植入诺瓦-T型节育器和780例植入铜-T型节育器的结果。在每个年龄组和产次组中，诺瓦-T型节育器的妊娠率都较低。铜-T-200型节育器的妊娠率在参与研究的国家中有所不同，而诺瓦-T型节育器在每个国家的妊娠率都同样低。与铜-T型节育器相比，诺瓦-T型节育器因排出导致的终止使用率受年龄和产次的影响较小。在不同国家之间，使用同一装置的续用率存在显著差异。因感染而取出节育器的情况表明，无论产次如何，25岁以下的女性感染风险较高。
