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  • Title: [Nova-T and Copper-T 200 in a five year's clinical comparison].
    Author: Nygren KG, Allonen H, Nielsen NC, Luukkainen T, Pyorala T.
    Journal: Contracept Fertil Sex (Paris); 1983 Nov; 11(11):1179-84. PubMed ID: 12312701.
    Abstract:
    A 5 year multicenter randomized study was conducted in Denmark, Finland, and Sweden to compare 2 copper IUDs, the Copper T 200 (Cu T200) and the Nova-T. The 2 devices have the same type of copper wire surrounding a central part made of silver, and both have surface areas of 200 sq mg. The effective life of both devices has been estimated at 5 years at least. 1865 insertions were made, 322 after legal abortions and the remainder intramenstrually. For the Nova-T, the cumulative net and crude rates/100 women were 2.2 and 3.4 for pregnancy, 9.3 and 12.5 for expulsion, 26.7 and 34.7 for pain and bleeding, 4.8 and 7.2 for infection, 2.9 and 5.1 for other medical cause, 14.5 and 23.3 for desire for pregnancy, 6.4 and 10.9 for other personal cause. For the Cu T200, the rates were 5.8 and 8.7 for pregnancy, 7.2 and 9.9 for expulsion, 23.7 and 29.8 for pain and bleeding, 4.3 and 6.5 for infection, 5.2 and 8.3 for other medical cause, 12.3 and 19.3 for desire for pregnancy, and 5.5 and 10.0 for other personal cuase. In 27,540 woman-months of use of the Nova-T and 29,481 woman-months of use of the Cu T200 respectively, there were 18 and 49 pregnancies, 79 and 62 expulsions, 218 and 204 removals for pain and bleeding, 39 and 37 for infection, 23 and 43 for other medical causes, 114 and 100 for desire for pregnancy, and 51 and 43 for other personal causes. There were 918 insertions of the Nova-T and 947 of the Cu T200. Among Nova-T and Cu T200 users respectively, 103 and 112 left the study, 153 and 172 completed 60 months of use, and 120 and 125 were lost to follow-up. The Pearl Index was .8 for the Nova-T and 2.0 for the Cu T200. There were 2 extrauterine pregnancies with the Nova-T and 5 with the Cu T200. Pregnancy rates for the Nova-T were lower in all 3 countries. Finland had the highest pregnancy rates and the lowest rate of removal for pain or bleeding. The pregnancy rate of the Cu T200 was strongly influenced by age and parity. The pregnancy rate of the Nova-T was less affected by age and was independent of parity. The rates of removal for pain and bleeding indicate that the Nova-T was as well tolerated by young women and nulliparas as by older parous women.
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