Calendar rhythm efficacy: a review.

@article{Kambic1996CalendarRE,
  title={Calendar rhythm efficacy: a review.},
  author={Robert T Kambic and Virginia M. Lamprecht},
  journal={Advances in contraception : the official journal of the Society for the Advancement of Contraception},
  year={1996},
  volume={12 2},
  pages={123-8}
}
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… CONTINUE READING

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