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The failure rate of fertility awareness varies widely depending on the system used to identify fertile days, the instructional method, and the population being studied. Some studies have found actual failure rates of 25% per year or higher.
A woman whose menstrual cycles ranged in length from 30 to 36 days would be estimated to be infertile for the first 11 days of her cycle (30-19=11), to be fertile on days 12–25, and to resume infertility on day 26 (36-10=26). When used to avoid pregnancy, such fertility awareness-based methods have a typical-use failure rate of 25% per year. [18]
The failure rate of a copper IUD is approximately 0.8% and can prevent pregnancy for up to 10 years. The hormonal IUD (also known as levonorgestrel intrauterine system or LNg IUD) releases a small amount of the hormone called progestin that can prevent pregnancy for 3–8 years with a failure rate of 0.1-0.4%. [1]
For avoiding pregnancy, the perfect-use failure rate of Creighton was 0.5%, which means that for each year that 1,000 couples using this method perfectly, that there are 5 unintended pregnancies. The typical-use failure rate, representing the fraction of couples using this method that actually had an unintended pregnancy, is reported as 3.2% ...
Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [1] [2] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [3]
Adolescent fertility correlates strongly with poverty in African nations. The highest rate of teenage pregnancy in the world—143 per 1,000 girls aged 15–19 years—is in sub-Saharan Africa. [4] Women in Africa, in general, get married at a much younger age than women elsewhere—leading to earlier pregnancies.
In fact, between 1970 and 2012 this has resulted in a 25% increase of child poverty rates. One study also concluded that if women under the age of 30 began using birth control pills as a preventative measure against unplanned pregnancies, the child poverty rate could drop around half a percentage point within a year. [81]
IUDs are safe and effective in adolescents as well as those who have not previously had children. [6] [7] Once an IUD is removed, even after long-term use, fertility returns to normal rapidly. [8] Copper devices have a failure rate of about 0.8%, while hormonal (levonorgestrel) devices fail about 0.2% of the time within the first year of use. [9]