The Billings Ovulation Method® is a method of family planning that helps women to identify their fertile days by teaching them to evaluate the characteristics of the cervical mucus during the menstrual cycle. One of the first scientific studies on the Billings Ovulation Method appeared in the medical journal The Lancet about fifty years ago. The authors, who included Drs. John and Evelyn Billings, described the method "to be both acceptable and successful" in a trial that was undertaken in the island of Tonga. In that trial "282 women used the ovulation method for a total of 2503 months, with one case of method failure and two cases of user failure."(Weissmann et al. 1972)
In the same year and journal, Drs. Billings published the "Symptoms and hormonal changes accompanying ovulation", Where they "concluded that the time of ovulation can be identified clinically, without recourse to temperature measurement or more specialised tests."(Billings et al. 1972)
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