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Study of contraceptive mobile app fails to provide convincing findings

      This is the third study by the company Natural Cycles on their product, a mobile phone fertility tracking app, based on an algorithm that relies primarily on basal body temperature shifts and menstrual cycle lengths [
      • Berglund Scherwitzl E.
      • Lundberg O.
      • Kopp Kallner H.
      • Gemzell Danielsson K.
      • Trussell J.
      • Scherwitzl R.
      Perfect-use and typical-use pearl index of a contraceptive mobile app.
      ]. The first two studies by Bergund Scherwitzl et al. have already been criticized [
      • Frank-Herrmann P.
      • Stanford J.B.
      • Freundl G.
      Fertility awareness-based mobile application.
      ].
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      References

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        • Lundberg O.
        • Kopp Kallner H.
        • Gemzell Danielsson K.
        • Trussell J.
        • Scherwitzl R.
        Perfect-use and typical-use pearl index of a contraceptive mobile app.
        Contraception. 2017; 96: 420-425
        • Frank-Herrmann P.
        • Stanford J.B.
        • Freundl G.
        Fertility awareness-based mobile application.
        Eur J Contracept Reprod Health Care. 2017; 22 ([Epub 2017 Aug 29]): 396-397https://doi.org/10.1080/13625187.2017.1362691
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        Identification and prediction of the fertile window using NaturalCycles.
        Eur J Contracept Reprod Health Care. 2015; 20 ([Epub 2015 Aug 26]): 403-408https://doi.org/10.3109/13625187.2014.988210
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        Relationships between the luteinizing hormone surge and other characteristics of the menstrual cycle in normally ovulating women.
        Fertil Steril. 2013; 99: 279-285