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The use-effectiveness of copper IUDs.

The longterm use-effectiveness of 3 copper IUDs Lippes Loop D Cu-T-200 and Cu-7-200 is examined. Women fitted with either of the 3 types had a similar distribution of age and parity. Overall cumulative pregnancy rates for all 3 devices were not significantly different (p > .1). Cumulative pregnancy rates for the Cu-T-200 and Cu-7-200 did not increase more rapidly with increasing duration of IUD use. Overall cumulative discontinuation rate for all medical reasons was significantly higher (P < .1) for the Cu-T-200 than for the Cu-7-200. Although it was initially recommended that IUDs containing filamental copper be removed after 2 years because of expected copper depletion this study suggests that both of these copper-containing devices provide adequate protection for up to 5 years. On the basis of pregnancy rates alone all 3 IUDs are acceptable for use in a family planning clinic. However because the cumulative discontinuation rate for all medical reasons was significantly lower for the Cu-7-200 compared with the 2 other devices use of this IUD may be preferable.