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Intrauterine devices are used by only 1% of women of reproductive age in the U.S. This report from the World Health Organization found the Copper T380A IUD, marketed as a 10-year device, to remain effective 12 years after insertion.
Between 1981 and 1986 this international randomized study recruited women to participate in a comparison of the Copper T220C (3,277 women) and the Copper T380A, the only copper IUD available in the U.S. (1,396 women). After 12 years, the cumulative intrauterine pregnancy rates were 7.0 and 1.9 per 100 women for the T220C and the T380A, respectively. Pregnancy rates were higher in the first years after IUD insertion and were consistently higher in the 220C users. After the first 8 years of use, no women with the 3…