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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 Population Reference Bureau (PRB) ranking list is based on the data of the 2024 World Population Data Sheet [6] published online. The PRB [7] is a private, nonprofit organization which informs people around the world about population, health and the environment for research or academic purposes. It was founded in 1929.
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They have typical first-year failure rates of 24%; perfect use first-year failure rates depend on which method is used and range from 0.4% to 5%. [24] The evidence on which these estimates are based, however, is poor as the majority of people in trials stop their use early. [92] Globally, they are used by about 3.6% of couples. [94]
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%.
Canada's fertility rate hit a record low of 1.4 children born per woman in 2020, [30] below the population replacement level, which stands at 2.1 births per woman. In 2020, Canada also experienced the country's lowest number of births in 15 years, [30] also seeing the largest annual drop in childbirths (−3.6%) in a quarter of a century. [30]
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 ...