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Salient. Victoria University Student Newspaper. Volume 39, Number 21, September 6, 1976.

Rhythm Method

Rhythm Method

This depends on the accurate pinpointing of the time of ovulation and abstaining for enough time on either side of this point so that sperm do not come in contact with the ovum. The life of both sperm and ovum is taken into account. If periods are irregular, even if a temperature chart is kept, this exact time is hard to determine and consequently the failure rate is very high.

Effectiveness of Method
Method Theoretical Failure Method Failure
Oral contraceptives 0 0.5
I.U.D. 1.5 - 8 1.5 - 8
Diaphragm & Jelly 5.0 - 10
Vaginal Spermicides 15.0 - 25
Condom 10.0 - 15
Coitus Interruptus 20.0 - 30

Sue Aitchison-Windeler

Drawing of a snake