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The Pearl Index, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control method. It is a very approximate measure of the number of unintended pregnancies in 100 woman-years of exposure that is simple to calculate, but has a number of methodological deficiencies.
Contraceptive use among women in Sub-Saharan Africa has risen from about 5% in 1991 to about 30% in 2006. [7] However, due to extreme poverty, lack of access to birth control, and restrictive abortion laws, many women still resort to clandestine abortion providers for unintended pregnancy, resulting in about 3% obtaining unsafe abortions each year.
For example, a failure rate of 20% means that 20 of 100 women become pregnant during the first year of use. Note that the rate may go above 100% if all women, on average, become pregnant within less than a year. In the degenerated case of all women becoming pregnant instantly, the rate would be infinite.
Quantification of profound developments regarding the prevalence of contraception can be achieved by looking at the contraceptive prevalence rate (CPR). It takes into account all sources of supply and all contraceptive methods. [3] In less than forty years, the CPR increased from 8% in 1975 to 62% in 2014.
Even when used perfectly, calendar-based methods, especially the rhythm method, result in a high pregnancy rate among couples intending to avoid pregnancy. Of commonly known methods of birth control, only the cervical cap and contraceptive sponge have comparably high failure rates. This lower level of reliability of calendar-based methods is ...
[105] In Mozambique, despite efforts in improving access to modern contraceptive methods, the general fertility rate is "still high at 5.3 and the unmet need for contraceptives is also high at 26%." Among young women, the fertility rate has dramatically increased from 167 births per 1000 aged between (15–19 years) in 2011 to 194 in 2015 with ...
Modern contraceptives using steroid hormones have perfect-use or method failure rates of less than 1% per year. The lowest failure rates are seen with the implants Jadelle and Implanon, at 0.05% per year. [9] [10] According to Contraceptive Technology, none of these methods has a failure rate greater than 0.3% per year. [10]
9% failure rate with typical use (method not used consistently or correctly) 0.3% failure rate with perfect use [7] [18] Meant to be taken at the same time every day (some pills can be taken within 2–24 hours and still be effective) [19] Combined contraceptive patch [7] 120-150 μg of norelgestromin and 20-35 μg ethinyl estradiol daily [20 ...