Testing the Clinical Performance of an IUD
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The results of clinical trials with the same IUD show great variations. In a multiclinic study in Finland with Cu-T200 the pregnancy rate at twelve months varied between 0.0 and 5.5 in different clinics (Luukkainen et al. 1975). A collaborative study (Sivin 1973) performed in five countries reported pregnancy rates from 0.3 to 2.9 and removal rates from 6.9 to 21.0 for Cu-T200. Both studies were carefully planned to minimize the clinical effect. The same instructions for insertion technique and for the patients were used. The clinical records were the same in the different clinics and data were collected and analyzed in one unit. It is evident that the results of various investigators on the performance of the same IUD, using different insertion techniques and data collection, are more variable than the results in these studies, where guidelines were kept similar by the central team.
KeywordsRemoval Rate Pregnancy Rate Pelvic Inflammatory Disease Intrauterine Device Insertion Technique
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