<prompt> Contraceptive LNG-IUD levonorgesterol intra-uterine device has the cumulative pregnancy rate at 5 yrs of:0.511.52  <response>: This is the closest choice in reference to the claimed rate by the manufacturer after phase three trials where the five-year cumulative pregnancy rate is 0.7 percent.LNG-IUD releases approximately 20 mcg levonorgestrel per day initially then 10 mcg day. LNG does not increase the risk of PID. Lesser ectopic pregnancy as compared with copper devices. 