The effectiveness of birth control methods varies:
Hormonal methods like pills and patches are over 99% effective when used correctly. Barrier methods like condoms are about 85% effective due to user error. IUDs are over 99% effective and can last several years. Permanent methods are almost 100% effective but are irreversible. Natural methods are around 76-88% effective, depending on accurate tracking. Emergency contraception is 85-89% effective when taken within 72 hours after unprotected sex.
