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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.
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% ...
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 "safe period" method of fertility awareness is the most common family planning method used in India, although condoms are used by some. [35] Of all American women surveyed nationally in 2002, only 0.9% were using "periodic abstinence" (defined as "calendar rhythm" and "natural family planning") compared to 60.6% using other contraceptive ...
Typical use of this method is associated with a pregnancy rate of 1 to 22%. [1] A World Health Organization study found that 15% is caused by a conscious departure from method rules. [1] The percentage of people who stop using the method after a year is 1–24%. [1] Perfect use has been estimated to result in pregnancy in 0.5–3%.
In 2016, adolescent birth rates between the ages of 15-19 was 45 per 1000. [19] In 2014, 1 in 3 experienced sexual violence , and there more than 1.2 million deaths. The top three leading causes of death in females between the ages of 15-19 are maternal conditions 10.1%, self-harm 9.6%, and road conditions 6.1%.
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]
In 2022, UNICEF reported that from 2000 to 2022, "the global adolescent birth rate for the age group 10–14 has declined by over 50 percent, from 3.3 to 1.6 per 1,000 adolescent girls aged 10–14", and "for the age group 15–19 has declined by over 30 percent, from 65 to 43 births per 1,000 adolescent girls aged 15–19". [18]