Advances in Contraception

, Volume 14, Issue 4, pp 201–207 | Cite as

Results of an Efficacy-Finding Study (EFS) with the Computer-Thermometer Cyclotest 2 Plus Containing 207 Cycles

  • G. Freundl
  • P. Frank-Herrmann
  • M. Bremme


Prospectively collected cycles of 207 women were used to find out the efficacy of the Cyclotest 2 plus algorithm in detecting the fertile time in a woman's cycle. The results of the device were compared with the beginning and the end of the fertile time identified by the symptothermal method (STM) of natural family planning (NFP). It was found that the algorithm led to dangerous reduction of the fertile time (FT) in only 2 out of 207 woman cycles (0.96%). However, at the end of fertile time (FE) the device requested more abstinence than was necessary in about 12% of the cycles. We feel that more research should be performed on detecting the end of the fertile time.


Public Health Family Planning Natural Family Natural Family Planning Fertile Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Freundl G, Frank-Herrmann P, Gnoth C. Rhythm and devices. Eur J Contracept Reprod Health. 1998;3.Google Scholar
  2. 2.
    Arbeitsgruppe NFP. Natürlich und sicher. München: Ehrenwirth Verlag; 1994.Google Scholar
  3. 3.
    Freundl G, Bonnar J, Flynn AM, Frank-Herrmann P, Kirkman R, Snowden R. Effektivität cines neuen Verhütungscomputers “PERSONA” Bericht über Testergebnisse in Deutschland. Fortschritte in der Medizin, Originalien 1998; 1/1198:25–30.Google Scholar
  4. 4.
    Weinberg CR, Gladen BC, Wilcox AJ. Models relating the timing of intercourse to the probability of conception and the sex of the baby. Biometrics. 1994;50:358–67.PubMedGoogle Scholar
  5. 5.
    Bonnar J, Collins W, Freundl G, May K, Snowden R, Senior S. Natural Contraception through Personal Hormone Monitoring. Unipath Publications; 1996.Google Scholar
  6. 6.
    Moreno JE, Khan DF, Goldzieher JW. Natural family planning: suitability of the CUE method for defining the time of ovulation. Contraception. 1997;55:233–7.PubMedGoogle Scholar
  7. 7.
    Freundl G, Bremme M, Frank H-P, Baur S, Godehardt E, Sottong U. The CUE fertility monitor compared to ultrasound and LH peak measurements for fertile time ovulation detection. Adv Contracept. 1996;12:111–21.PubMedGoogle Scholar
  8. 8.
    Loewit K, Hoppichler F, Ledermuller G, Widhalm G. Ovulation prediction from cyclic changes in salivary electrical conductivity [letter]. Am J Obstet Gynecol. 1990;163:708–10.PubMedGoogle Scholar
  9. 9.
    Freundl G, Baur S, Bremme M et al. Temperaturcomputer zur Bestimmung der fertilen Zeit im Zyklus der Frau: Babycomp, Bioself 110, Cyclotest D. Fertilität. 1992;8:66–76.Google Scholar

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • G. Freundl
    • 1
  • P. Frank-Herrmann
    • 1
  • M. Bremme
    • 1
  1. 1.Frauenklinik des Städt. Krankenhauses Düsseldorf-BenrathAcademic Teaching Hospital of the University of DüsseldorfGermany

Personalised recommendations