Figure 5. Estimated survival curves for fertilized ova. Scenario A assumes that 40% of fertilized ova will be lost before implantation, while Scenario B assumes 50%. The bar plot at the right of each panel shows the cumulative fate of fertilized ova: loss or live birth. By these estimates, 60–67% of fertilized ova do not result in a live birth, with the largest proportion of loss in both scenarios occurring prior to implantation.