Calendar rhythm efficacy: A review

R. T. Kambic, V. Lamprecht

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Objective: To estimate the unplanned pregnancy rate of calendar rhythm. Design: Meta-analysis of eight studies of calendar rhythm published between 1940 and 1989. Results: There exist few studies of the calendar rhythm method. Analysis of the best of these studies resulted in a conservative estimated Pearl rate of 18.5 ± 1.8, and a less conservative estimate of 15.0 ± 4.0, standardized to 12 months' observation; these results are in the range of other natural and barrier methods. Discussion: We need properly done clinical trials of the calendar rhythm method to scientifically establish its effectiveness.

Original languageEnglish (US)
Pages (from-to)123-128
Number of pages6
JournalAdvances in Contraception
Issue number2
StatePublished - Jun 1996

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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