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Clinical Study II - Effectiveness of Natural Cycles

In a second clinical study performed with one of the leading researchers in contraception from Karolinska University Hospital, the effectiveness of Natural Cycles, if used as a birth control, was evaluated.

In a retrospective clinical trial, the application's efficiency as a contraceptive method was challenged and 4054 women used the application as contraception for 2053 woman-years.

The number of identified unplanned pregnancies were 143, resulting in a total pregnancy rate of 7.0 according to the Pearl Index. 10 of the pregnancies were due to the application falsely attributing a safe day within the fertile window, producing a method failure rate of 0.5. 

The study is published in the European Journal of Contraception and Reproductive Healthcare and can be read here: http://www.tandfonline.com/doi/full/10.3109/13625187.2016.1154143