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Four-year experience in a randomized study of the Gyne T 380 slimline and the standard Gyne T 380 intrauterine copper devices

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      Abstract

      Performance of the Slimline and Standard models of the Gyne T 380 were measured through four years in a comparative study initially involving 996 women, seventy percent of whom were randomized to the Slimline device. Cumulative pregnancy rates of Slim-line users were 0.3 ± 0.2 per 100 both at three and at four years, as compared with rates of1.5 ± 0.9 and 3.8 ± 1.7 at the same intervals for users of the Standard model (P > .05). The four-year explusion rate of the Slimline, 8.6 ± 1.3 per 100, was significantly higher than the comparable rate of the Standard model, 4.4 ± 1.6 (P < .05). The two Gnye T models did not differ in continuation rates. First time IUD users, however, had substantially lower continuation rates than did former users (P < .001), in consequence of their relative youth and desire to have additional children. Other performance measures did not differ importantly by device.
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