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Just studying for my health class and I came across this chart which references the book Contraceptive Technology-17th Edition (1998).
The chart gives the # of unintended pregnancies per 100 women during the first year of use for each method of BC.
The Pill - with perfect use : 0.1
The Pill - with typical use (which is me, I did used to forget it the odd time) : 5.0
The Symptothermal Method : 2.0
Cervical Mucous (ovulation) Method : 3.0
It is worth noting that the symptothermal and CM methods only had data for perfect use, I assume due to the fact that you either follow it or you don't.
I showed this to DH!! He seemed surprised to see it in my text book!![/b]
I think the STM and Cervical Mucus method numbers are a little inflated actually. The Billings Method (one form of the Cervical Mucus Method) is scientifically verified as 99.64% reliable, so that's a pregnancy rate less than 0.4%.
A recent report on the Sympto Thermal Method found it's pregnancy rate to be 0.4% as well. http://news.bbc.co.uk/2/hi/health/6375261.stm
It's pretty cool that your book had information on it at all though! I remember getting so mad when I was becoming a nurse because my medical texts would always lump the effectiveness for natural methods in with the Rhythm or Calender Method! Grrrrr! They are SOOOO not the same thing!