This review about a fertility awareness-based mobile application for contraception, written by Elina Berglund Scherwitzl, Kristina Gemzell Danielsson, Jonas A. Sellberg and Raoul Scherwitzl already has been viewed nearly 7500 times, being the most viewed article of the European Journal of Contraception and Reproductive Health Care in 2016.
The aim of this review was to retrospectively evaluate the effectiveness of a fertility awareness-based method supported by a mobile-based application to prevent unwanted pregnancies as a method of natural birth control.
In a retrospective analysis, the application’s efficiency as a contraceptive method was examined on data from 4054 women who used the application as contraception for a total of 2085 woman-years.
The number of identified unplanned pregnancies was 143 during 2053 woman-years, giving a Pearl Index of 7.0 for typical use. Ten of the pregnancies were due to the application falsely attributing a safe day within the fertile window, producing a perfect-use Pearl Index of 0.5. Calculating the cumulative pregnancy probability by life-table analysis resulted in a pregnancy rate of 7.5% per year (95% confidence interval 5.9%, 9.1% per year).
It was concluded by the authors that the application appears to improve the effectiveness of fertility awareness-based methods and can be used to prevent pregnancies if couples consistently protect themselves on fertile days.
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