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Ok I'm gonna do a thread on different known contraceptive methods and compare to none use even and give rates of failure based on what is referred to as "typical use", which refers to how the general population is likely to use that particular form of contraceptives.
The numbers are based on the likelihood of getting pregnant within the first year of using a particular form of contraceptive.
This is different from perfect use which would be what would happen if the contraceptive method was used as prescribed. Please note that even with perfect use there's no 100% reduction of pregnancy rate
If a couple had regular sex without contraception, there's an 85% chance of falling pregnant.
Typical use of a female condom has pregnancy rates of 21% in the first year of use. Perfect use drops this to 5%
Male condoms are at 15%. With a rate of 2% with perfect use
Coitus interuptus (pulls out game) has a 27% risk of pregnancy and you can get better than 4% with perfect use
Fertility awareness(timing your cycle, baseline temperature and the likes) is actually better than "pull out" at 25% pregnancy risk but has a 4 % pregnancy risk with perfect use.
Injectable progesterone contraceptives (depo, nur-esterate) has a 3% pregnancy risk with typical use and 0.3% with perfect use.
Your contraceptive pills, patch, and nuva ring reduce pregnancy rate to about 8 % with typical use with perfect use it's at around 0.3 %
Now comes my favorites, the so called long acting reversible contraceptives. Cream of the crop contraceptives in that they're administered once and left for some years before needing to remove them and are way better at preventing pregnancy.
Typical and perfect use are similar in that the pregnancy ratebin allnof them is less than 1% within the first year of use.
There's a 0.8% chance of getting pregnant with a copper IUD.
Progesterone IUD (like mirena) has a pregnancy risk of 0.2
Progesterone IUD (like mirena) has a pregnancy risk of 0.2
The implanon is actually very very effective and has a pregnancy risk of 0.05. Typical use and perfect use.
The more permanent methods include tubal ligation (tying tubes/female sterilization) has a 0.5% pregnancy risk and vasectomy (male sterilization) has a 0.15 percent pregnancy risk.
This just addresses risks of failure in all these contraceptive methods. Most times reasons cannot be given why a contraceptive method fails.
With some methods, risks are even lower with subsequent years (your long acting and permanent contraceptives as mentioned) whilst others the risks are more (coitus interuptus, fertility awareness etc)
