<prompt> Contraceptive LNG - IUD levonorgesterel intra - uterine device has the cumulative pregnancy rate at 5 yrs of :0.511.52  <response>: Ans. is a i.e. 0.5 LNG - IUD has a pregnancy rate of 0.2 per 100 women years HWY here nearest is 0.5 so that is the answer. CuT 380A has cumulative pregnancy rate after 7 years is 1.5 per 100 women years HWY and after 12 years 1.9 per 100 women years HWY. 