Allonen H, Luukkainen T, Nielsen N C, Nygren K G, Pyörälä T
Contraception. 1980 Apr;21(4):321-34. doi: 10.1016/s0010-7824(80)80011-4.
A random assignment comparative study between Nova T and Copper T 200 after two years of use revealed that the Nova T resulted in a significantly lower pregnancy rate than the Copper T. The study was performed simultaneously in Denmark, Sweden and Finland. The pregnancy rate in Nova T users was lower than in Copper T users in every country and in every age and parity group. There was no clinic effect in the pregnancy rate of Nova T users. The other termination rates of these two devices were not significantly different. The first segment continuation rates at two years of postmenstrual insertions were 64.7 for Nova T and 65.5 for Copper T 200. It seems that Nova T is an improved copper-releasing IUD.
