Contraceptive LNG-IUD (levonorgesterol intra-uterine device) has the cumulative pregnancy rate at 5 yrs of:

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.