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Table 1 Failure rate of various forms of contraception (Contraception, 2015)

From: Mars ain’t the kind of place to raise your kid: ethical implications of pregnancy on missions to colonize other planets

Birth control method Failure rate
Implant 0.05 %
Male sterilization (vasectomy) 0.15 %
Levonorgestrel IUD 0.2 %
Female sterilization (tubal ligation) 0.5 %
Copper Intrauterine Device (IUD) 0.8 %
Injection (“shot”) 6 %
Oral contraceptives (“the pill”) 9 %
Patch 9 %
Hormonal vaginal contraceptive ring 9 %
Diaphragm 12 %
Male condom 18 %
Female condom 21 %
Spermicides 28 %