The perfect use failure rate for symptoms-based fertility awareness is (according to Wikipedia anyway) 0.6% per woman per year. (So, 1 woman in 167 per year.) The typical use failure rate is 1.8%, or 1 woman in 56.
Sorry, my question is: How does one use symptoms-based perfectly?
My understanding is that a perfect use case happens only a few days each month. So on those few days, you might have very low "failure" rates, but on the other 25 days per month, is a "perfect use" possible?
splat|11 years ago
mountainair|11 years ago