A. To achieve a pregnancy: Conception will occur 76% of the time in the first cycle of using a defined day of fertility.

B. To avoid a pregnancy: The system is over 99% effective in avoiding a pregnancy when properly taught by a qualified teacher and then correctly applied.

C. With infertility: From 20-40% of couples will achieve a pregnancy with the Creighton Model System only. Up to 80% will achive with additional cooperative medical treatment. These numbers are dependent on the cause of the infertility.