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Calendar rhythm efficacy: a review

R T Kambic¹, V Lamprecht

¹Department of Population Dynamics, Johns Hopkins School of Hygiene and Public Health, Baltimore, MD 21205, USA.

Advances in Contraception : the Official Journal of the Society for the Advancement of Contraception

|June 1, 1996

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The calendar rhythm method has a high unplanned pregnancy rate, with estimated Pearl rates between 15.0 and 18.5. More rigorous clinical trials are needed to scientifically establish its effectiveness for family planning.

Area of Science:

Reproductive Health
Family Planning Methods
Contraception Efficacy

Background:

The calendar rhythm method is a natural family planning technique.
Limited scientific data exists on its effectiveness.
Previous studies vary in quality and scope.

Purpose of the Study:

To estimate the unplanned pregnancy rate associated with the calendar rhythm method.
To synthesize existing research on the efficacy of calendar rhythm.

Main Methods:

A meta-analysis was conducted on eight studies.
Studies were published between 1940 and 1989.
Data was standardized to 12 months of observation.

Main Results:

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Few studies on the calendar rhythm method are available.

A conservative estimated Pearl rate of 18.5 +/- 1.8 was found.

A less conservative estimate of 15.0 +/- 4.0 was also calculated.

These rates are comparable to other natural and barrier contraceptive methods.

Conclusions:

The effectiveness of the calendar rhythm method requires further scientific validation.
High-quality clinical trials are necessary to accurately establish its efficacy.
Current data suggests a significant rate of unplanned pregnancies.