One of the more recent studies on the effectiveness of natural family planning, conducted in Germany and published in 2007 in the journal Human Reproduction, found that the Sympto-Thermal method
results in 0.4 pregnancies per 100 women per year.
Studies show that the sympto-thermal method
of NFP is 99 percent effective, the same as the birth control pill.
We gave couple-to-couple instruction on the sympto-thermal method
of NFP, thus empowering and equipping couples to take charge of their sexual activity based on the natural fertility cycle and on their readiness to have children.
There is the Sympto-Thermal method
and then there are the two mucus-based methods; Catholic Insight featured the latter two methods in past issues.
Our involvement has been and is with Serena, a Canadian organization with over 45 years experience which teaches the Sympto-Thermal method
of fertility awareness, primarily on a couple-to-couple basis.
Two of the most common natural methods today are the Sympto-Thermal Method
and the Billings Ovulation Method.
The site has a clear but detailed overview on all the important terms and observations necessary for the various methods of NFP, as well as a methodical breakdown of each of the major NFP methods including the Calendar, Billings, and Sympto-Thermal methods