To establish the contraceptive efficacy of the Standard Days
Method® (SDM), researchers at Georgetown University conducted a prospective multi-center efficacy trial. A total
of 478 women, age 18-39 years with
self-reported cycles of 26-32 days, were admitted to the study, and followed
for up to 13 cycles during method use, contributing 4,305 cycles to the
analysis. Subsequently, through operations research SDM was introduced into
fourteen program settings in Latin America, Asia and Africa. A total of 1,165
women using SDM were regularly interviewed over a one year period. In the United States SDM is increasingly integrated in punlic and private family planning programs.
Results from Efficacy Trial
The study demonstrated that the SDM is an effective method
of family planning. The life-table one-year pregnancy rate was 4.8 with correct
use and 12.0 with typical use, demonstrating that method efficacy is comparable
to other user-controlled methods currently available.
Approximately 68% of study participants were still using the
method at the end of 13 cycles, and 67% two years later.
Irregular cycles (having two cycles out of the 26-32 day
range) were the most common reason for leaving the study (28%). Only 4% left the study because they or their partner did not
like or trust the method. 45% of women who discontinue the method want to become pregnant.
Click to read more about the efficacy trial of SDM.