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Data of Trussell et al for the Probability of Conception After Intercourse on a Given Day of the Menstrual Cycle Relative to the Day of Ovulation

Description

Trussell et al compiled data for the probability of conception if unprotected intercourse occurs on a given day of the menstrual cycle relative to the day of ovulation. The authors are from Princeton University and the Population Council of New York.


Day of Cycle

Probability of Any Conception

Probability of Recognizable Conception

-6 or earlier

< 1%

< 1%

-5

4%

4%

-4

16%

14%

-3

19%

16%

-2

26%

28%

-1

31%

30%

0 (day of ovulation)

22%

12%

+1

5%

5%

+ 2 or later

< 1%

< 1%

from Table 2, page 366.

 

where:

• There are different ways to identify the day of ovulation.

• The data assumes only 1 episode of unprotected intercourse.

• The populations were English and American. The results could vary in different racial groups.

 


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Specialty

ICD-10