摘要：

A comparative study of 2 years duration is reported which compared various rates associated with the use of 2 copper IUDs Nova T and Copper T devices. The clinical centers contributing to this report were located in Finland Sweden and Denmark. Data are reported by age parity and timing of insertion. 4 figures and 5 tables present the complete statistical results but in general the study revealed a significantly lower pregnancy rate for the Nova T than the Copper T which held true in every country and at every age and parity group. Terminations for bleeding/pain or terminations which were spontaneous did not differ between the 2 IUD types. Continuation rates at 2 years (the first segment of the study) of postmenstrual insertions were 64.7 and 65.5 for Nova T and Copper 5 respectively. A most important finding is the lack of clinic-specific differences in the pregnancy rate data; thus Nova T is thought to be an improved copper-containing IUD.

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