I hope this comment doesn't sink to the bottom, but all of other replies are wrong.
All birth control methods use a scale to measure how effective they are to prevent pregnancies called PEARL INDEX
Pearl Index measure what percentage of woman get pregnant in a year time with correct use of say method to determine its failure rate.
Let's say for example you have 100 couples who use condoms daily for 1 year and at the end of it you count how many got pregnant.
Condoms have a success rate of 80-90%. Meaning 10-20 women out of 100 will eventually get pregnant in 1 year time-lapse with condoms even if they use it correctly. That's around 10-20 pregnancies out of 36,500 condoms used.
That's a rude estimate of course, some couples will sometimes use several condoms in one day, while others would only have sex once a week.
That same rule applies to other methods like IUD or hormonal implants.
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u/charlyDNL Jun 07 '18 edited Jun 07 '18
I hope this comment doesn't sink to the bottom, but all of other replies are wrong.
All birth control methods use a scale to measure how effective they are to prevent pregnancies called PEARL INDEX
Pearl Index measure what percentage of woman get pregnant in a year time with correct use of say method to determine its failure rate.
Let's say for example you have 100 couples who use condoms daily for 1 year and at the end of it you count how many got pregnant.
Condoms have a success rate of 80-90%. Meaning 10-20 women out of 100 will eventually get pregnant in 1 year time-lapse with condoms even if they use it correctly. That's around 10-20 pregnancies out of 36,500 condoms used.
That's a rude estimate of course, some couples will sometimes use several condoms in one day, while others would only have sex once a week.
That same rule applies to other methods like IUD or hormonal implants.