What is the reported effectiveness rate of an IUD as a contraceptive?

An intrauterine device (IUD) is one of the most effective forms of long-term reversible contraception available. The reported effectiveness rate of 99% indicates that less than 1 in 100 women will become pregnant in a year of typical use. This high efficacy is due to the way IUDs work, either by preventing sperm from fertilizing an egg or by hindering the implantation of a fertilized egg.

Given that the other options suggest much lower effectiveness rates, they do not reflect the clinical evidence supporting IUDs as a leading contraceptive choice for those seeking to avoid pregnancy. This significant effectiveness rate contributes to its growing popularity among women for long-term family planning.