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.
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