Fertility metrics as a function of the number of cycles of attempted conception for example 5, at a female age of 40.

In example 5, couples are assumed to have peak intrinsic conception rates drawn from a beta distribution with α = 3 and β = 10; the distribution of female ages at which couples become sterile is as given in [24], Table 2; a couple's intrinsic conception rate declines linearly for 12.5 years prior to sterility.