A New Zealand randomized comparative study of three IUDs (Nova-T, MLCu375, MLAgCu250): 1-, 2- and 3-year results.
A randomized comparative study was made in New Zealand of 3 models of copper IUDs, the Nova-T, MLCu375 and MLAgCu250, with interval acceptors. Completing 3 years of use, there were 608 Nova-T (14,011 woman-months), 586 MLCu375 (14,161 woman-months) and 596 MLAgCu250 (14,614 woman-months). At 3 years, loss to follow-up was 5.2% for the Nova-T, 5.1% for the MLCu375 and 4.1% for the MLAgCu250. The Multiloads were significantly easier to insert and were preferred by the operators, as the insertion technique for the Nova-T was complicated. However, the Nova-T was significantly easier to remove. There was one perforation with a Nova-T in a puerperal breastfeeding woman. In the only 2 parameters that are comparable between series, accidental pregnancy and expulsion [1], the Multiloads have been shown to be superior with higher relevant continuation rates. At 3 years, the MLCu375 had a significantly lower accidental pregnancy rate and higher relevant continuation rate. The results obtained with the Nova-T are similar to those of the WHO study [2]. The MLCu375, with its potential for use up to 5 years, has been shown to be the superior device.
Wilson
J C
JC
Visiting Obstetrician and Gynaecologist, Greenlane/National Womens' Hospital, Auckland, New Zealand.
D003267:Contraception / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D015993:Life Tables; D011247:Pregnancy