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The World Health Organization considers the rhythm method to be a specific type of calendar-based method, and calendar-based methods to be only one form of fertility awareness. [ 2 ] More effective than calendar-based methods, systems of fertility awareness that track basal body temperature, cervical mucus, or both, are known as symptoms-based ...
In 1932, a Catholic physician published a book titled The Rhythm of Sterility and Fertility in Women describing the method, [14] and the 1930s also saw the first U.S. Rhythm Clinic (founded by John Rock) to teach the method to Catholic couples. [20]
The Calendar-Rhythm method is also considered a calendar-based method, though it is not well defined and has many different meanings to different people. Systems of fertility awareness may be referred to as fertility awareness–based methods; [5] the
Fertility in colloquial terms refers the ability to have offspring. In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. [1] [2] [3] The fertility rate is the average number of children born during an individual's lifetime.
In the fertility awareness-based method a woman who has a predictable and consistent menstrual cycle tracks the days that she is fertile. The typical woman has approximately 9 fertile days a month and either avoids intercourse on those days or uses an alternative birth control method for that period of time.
Charting of basal body temperatures is used in some methods of fertility awareness, such as the sympto-thermal method, and may be used to determine the onset of post-ovulatory infertility. [4] When BBT alone is used to avoid a pregnancy, it is sometimes called the Temperature Rhythm method.
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This model, like the Billings ovulation method, is based on observations of cervical mucus to track fertility. Creighton can be used for both avoiding pregnancy and achieving pregnancy. Creighton can be used for both avoiding pregnancy and achieving pregnancy.