1. Standard Days Method Advanced Slides 1

2. Efficacy Study of SDM Multi-site prospective study Services provided in existing programs Clients were followed monthly for 13 cycles Couples used the method correctly in 97% of cycles 478 women in the study, 43 got pregnant With correct use, the failure rate is 4.8 With typical use the failure rate is 12.0 2

3. The Standard Days Method is based on Viable sperm – up to 5 days Viable egg – up to 24 hours The probability of pregnancy relative to ovulation. 3

4. Probability of Pregnancy from Intercourse on Days Relative to Ovulation Pregnancy Rate Ovulation Source: Wilcox et al. 1998 4

5. The Standard Days Method is based on Menstrual Cycle mid-point ± 3 days Viable sperm – up to 5 days Viable egg – up to 24 hours The probability of pregnancy relative to ovulation. Timing of ovulation. 5

6. Probability of Ovulation Relative to Midpoint of Cycle 37% 16% 14% 12% 5% 7% 1% [Source: IRH Analysis of WHO 1981 data] 6

7. The Standard Days Method is based on Menstrual Cycle mid-point ± 3 days Viable sperm – up to 5 days Viable egg – up to 24 hours The probability of pregnancy relative to ovulation. Timing of ovulation. 7

8. Day 8Day 19 Determining the Fertile Window 8