Pregnancy rate after longer use of two copper IUDs
Kozuh-novak, M.; Andolsek, L.
Contraceptive Delivery Systems 1(2): 95-101
1980
ISSN/ISBN: 0143-6112 PMID: 12336244 Document Number: 446349
The life table method was used to analyze the longterm performance of 2 types of Copper IUDs in a study in Yugoslavia. Follow-up was carried out for 7 years in 93 Copper T 200 users and for 6 years in 165 Copper 7 users. The cumulative continuation rate for the Copper T 200 after 7 years was 46.2 and for the Copper 7 after 6 years was 42.9. Contrary to expectations, the pregnancy rate decreased with duration of use. Neither decreased coital frequency in higher ages nor the decreasing number of cases available for observation account for the lower pregnancy rate during the later years of follow-up. All data are tabulated and graphed. As a result of this study, it is concluded that Copper IUDs can be effective in preventing pregnancy for much longer than the recommended 3 years.