No to jeszcze kilka frazesów.
Instrukcja LADY-COMP powiada:
Based on your morning temperature, taken orally, the fertility computer determines your fertile days and shows you when you are ovulating by recording, analyzing and storing your menstrual cycle data.
Wniosek: urządzenie dokonuje kalkulacji z użyciem metody termicznej (BBT).
Co to jest metoda BBT:
Basal body temperature (BBT) elevation, another older method, retrospectively identifies fertility. The luteinizing hormone surge, which stimulates ovulation, is associated with a 0.5- to 1°F- (0.3- to 0.6°C-) rise in BBT measured with highly standardized methods. BBT can be taken orally, vaginally, or rectally with a sensitive thermometer; the same site should be used daily. BBT is measured on awakening at approximately the same time every morning, before getting out of bed or doing any other activity. At least 6 hours of uninterrupted sleep the preceding night is necessary for accurate measurement. BBT remains elevated throughout the luteal phase secondary to higher progesterone levels. The woman is assumed to have ovulated after observing 3 consecutive days of temperature elevation. Pregnancy is avoided by abstaining from the beginning of menstruation until 3 to 4 days after the rise in BBT. All subsequent days until the beginning of her next menses are considered infertile.
Żródło: Clubb E, Knight J. Fertility awareness and natural family planning. Exeter, UK: Dave and Charles; 1999: 33?57.
Co to jest metoda objawowo-termiczna (SM):
The Symptothermal Method combines BBT, cervical methods, cervical position, and/or historical cycle data to prospectively and retrospectively identify the peri-ovulatory period. In its most effective form, 2 signs are used to ?double check? each phase as confirmation for the couple that the woman is unlikely to be fertile.20,26
Żródło: Prospective European multi-center study on natural family planning (1989?1992): interim results. The European Natural Family Planning Study Groups. Adv Contracept 1993; 9: 269?83.
Wniosek: Metoda SM jest skuteczniejsza od BBT.
Publikowane w badaniach wskaźniki skuteczności dla metody objawowo-termicznej (SM):
A. 1.8
B. 2.3
C. 2.5
A) Żródło: Frank-Hermann P. et al; ?The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple?s sexual behaviour during the fertile time: a prospective longitudinal study; Human Reproduction; Feb 2007; p1-10.
B) Żródło: Frank-Herrmann et al; ?Effectiveness and acceptability of the symptothermal method of natural family planning in Germany; Am J Obstet Gynecol 1991; 165; 2052-4.
C) Żródło:Freundl G.; Prospective European multi-center study of natural family planning (1989-1992): interim results; Advances in contraception; 1993, 9; 269-283.
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Jakim cudem, w świetle powyższych badań, jest możliwe uzyskanie P = 0.7 za pomocą metody BBT (lub nawet metody SM)?
Naprawde nie warto się nabierać na marketoidalne zagrywki.